gdb: update gnulib import

This is mostly to get this commit from gnulib:

    e22cd2677a4b7beacbf30b93bb0559f7b89f96ce
    Add ‘extern "C"’ to count-one-bits.h etc.

... which fixes this compilation problem I observed with clang++:

      CXXLD  gdb
    arch/arm-get-next-pcs.o:arm-get-next-pcs.c:function thumb_get_next_pcs_raw(arm_get_next_pcs*): error: undefined reference to 'count_one_bits(unsigned int)'
    <more such undefined references>

I built-tested on GNU/Linux x86-64 (gcc-9 and clang-9) as well as with the
x86_64-w64-mingw32-gcc cross-compiler.

gnulib/ChangeLog:

	* update-gnulib.sh (GNULIB_COMMIT_SHA1): Bump to
	e22cd2677a4b7beacbf30b93bb0559f7b89f96ce.
	* Makefile.in, config.in, configure, import/*: Re-generate.

1 files changed, 138 insertions, 0 deletions

diff --git a/gnulib/import/mbrtowc-impl-utf8.h b/gnulib/import/mbrtowc-impl-utf8.h
new file mode 100644
index 0000000..a826b1b
--- /dev/null
+++ b/gnulib/import/mbrtowc-impl-utf8.h
@@ -0,0 +1,138 @@
+/* Convert multibyte character to wide character.
+   Copyright (C) 1999-2002, 2005-2020 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2008.  */
+
+/* This file contains the part of the body of the mbrtowc and mbrtoc32 functions
+   that handles the special case of the UTF-8 encoding.  */
+
+        /* Cf. unistr/u8-mbtouc.c.  */
+        unsigned char c = (unsigned char) p[0];
+
+        if (c < 0x80)
+          {
+            if (pwc != NULL)
+              *pwc = c;
+            res = (c == 0 ? 0 : 1);
+            goto success;
+          }
+        if (c >= 0xc2)
+          {
+            if (c < 0xe0)
+              {
+                if (m == 1)
+                  goto incomplete;
+                else /* m >= 2 */
+                  {
+                    unsigned char c2 = (unsigned char) p[1];
+
+                    if ((c2 ^ 0x80) < 0x40)
+                      {
+                        if (pwc != NULL)
+                          *pwc = ((unsigned int) (c & 0x1f) << 6)
+                                 | (unsigned int) (c2 ^ 0x80);
+                        res = 2;
+                        goto success;
+                      }
+                  }
+              }
+            else if (c < 0xf0)
+              {
+                if (m == 1)
+                  goto incomplete;
+                else
+                  {
+                    unsigned char c2 = (unsigned char) p[1];
+
+                    if ((c2 ^ 0x80) < 0x40
+                        && (c >= 0xe1 || c2 >= 0xa0)
+                        && (c != 0xed || c2 < 0xa0))
+                      {
+                        if (m == 2)
+                          goto incomplete;
+                        else /* m >= 3 */
+                          {
+                            unsigned char c3 = (unsigned char) p[2];
+
+                            if ((c3 ^ 0x80) < 0x40)
+                              {
+                                unsigned int wc =
+                                  (((unsigned int) (c & 0x0f) << 12)
+                                   | ((unsigned int) (c2 ^ 0x80) << 6)
+                                   | (unsigned int) (c3 ^ 0x80));
+
+                                if (FITS_IN_CHAR_TYPE (wc))
+                                  {
+                                    if (pwc != NULL)
+                                      *pwc = wc;
+                                    res = 3;
+                                    goto success;
+                                  }
+                              }
+                          }
+                      }
+                  }
+              }
+            else if (c <= 0xf4)
+              {
+                if (m == 1)
+                  goto incomplete;
+                else
+                  {
+                    unsigned char c2 = (unsigned char) p[1];
+
+                    if ((c2 ^ 0x80) < 0x40
+                        && (c >= 0xf1 || c2 >= 0x90)
+                        && (c < 0xf4 || (c == 0xf4 && c2 < 0x90)))
+                      {
+                        if (m == 2)
+                          goto incomplete;
+                        else
+                          {
+                            unsigned char c3 = (unsigned char) p[2];
+
+                            if ((c3 ^ 0x80) < 0x40)
+                              {
+                                if (m == 3)
+                                  goto incomplete;
+                                else /* m >= 4 */
+                                  {
+                                    unsigned char c4 = (unsigned char) p[3];
+
+                                    if ((c4 ^ 0x80) < 0x40)
+                                      {
+                                        unsigned int wc =
+                                          (((unsigned int) (c & 0x07) << 18)
+                                           | ((unsigned int) (c2 ^ 0x80) << 12)
+                                           | ((unsigned int) (c3 ^ 0x80) << 6)
+                                           | (unsigned int) (c4 ^ 0x80));
+
+                                        if (FITS_IN_CHAR_TYPE (wc))
+                                          {
+                                            if (pwc != NULL)
+                                              *pwc = wc;
+                                            res = 4;
+                                            goto success;
+                                          }
+                                      }
+                                  }
+                              }
+                          }
+                      }
+                  }
+              }
+          }
+        goto invalid;