gold: configury: fix obsolete macros

Running `autoreconf -vf -Wall' in the gold directory shows errors about the use
of obsolete macros.  This patch fix the issues with macros used directly by
configure.ac. However, it doesn't fix all warnings.  There are autoconf warnings
about macros from files in config and one automake warning about a target being
shadowed.  It cuts a lot of the noise down and makes an upgrade to autoconf
2.71+ easier.

https://www.gnu.org/software/automake/manual/1.12.2/html_node/Obsolete-Macros.html#index-AM_005fCONFIG_005fHEADER
https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Obsolete-Macros.html#index-AC_005fOUTPUT-2133

gold/ChangeLog:

* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* configure.ac: Replace AM_CONFIG_HEADER by AC_CONFIG_HEADERS. Replace
        AC_OUTPUT(file list) by AC_CONFIG_FILES([file list])\nAC_OUTPUT.

Approved-by: Alan Modra <amodra@gmail.com>

3 files changed, 4 insertions, 31 deletions

diff --git a/gold/aclocal.m4 b/gold/aclocal.m4
index d0455aa..a8512a2 100644
--- a/gold/aclocal.m4
+++ b/gold/aclocal.m4
@@ -751,35 +751,6 @@ else
 fi
 ])
 
-#  -*- Autoconf -*-
-# Obsolete and "removed" macros, that must however still report explicit
-# error messages when used, to smooth transition.
-#
-# Copyright (C) 1996-2017 Free Software Foundation, Inc.
-#
-# This file is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-AC_DEFUN([AM_CONFIG_HEADER],
-[AC_DIAGNOSE([obsolete],
-['$0': this macro is obsolete.
-You should use the 'AC][_CONFIG_HEADERS' macro instead.])dnl
-AC_CONFIG_HEADERS($@)])
-
-AC_DEFUN([AM_PROG_CC_STDC],
-[AC_PROG_CC
-am_cv_prog_cc_stdc=$ac_cv_prog_cc_stdc
-AC_DIAGNOSE([obsolete],
-['$0': this macro is obsolete.
-You should simply use the 'AC][_PROG_CC' macro instead.
-Also, your code should no longer depend upon 'am_cv_prog_cc_stdc',
-but upon 'ac_cv_prog_cc_stdc'.])])
-
-AC_DEFUN([AM_C_PROTOTYPES],
-         [AC_FATAL([automatic de-ANSI-fication support has been removed])])
-AU_DEFUN([fp_C_PROTOTYPES], [AM_C_PROTOTYPES])
-
 # Helper functions for option handling.                     -*- Autoconf -*-
 
 # Copyright (C) 2001-2017 Free Software Foundation, Inc.
diff --git a/gold/configure b/gold/configure
index f4cb3f8..a81a04f 100755
--- a/gold/configure
+++ b/gold/configure
@@ -13590,6 +13590,7 @@ DEFS=-DHAVE_CONFIG_H
 
 ac_libobjs=
 ac_ltlibobjs=
+U=
 for ac_i in : $LIBOBJS; do test "x$ac_i" = x: && continue
   # 1. Remove the extension, and $U if already installed.
   ac_script='s/\$U\././;s/\.o$//;s/\.obj$//'
diff --git a/gold/configure.ac b/gold/configure.ac
index 90e51de..597788d 100644
--- a/gold/configure.ac
+++ b/gold/configure.ac
@@ -25,7 +25,7 @@ AC_CANONICAL_TARGET
 AM_INIT_AUTOMAKE([no-dist parallel-tests])
 AM_SILENT_RULES([yes])
 
-AM_CONFIG_HEADER(config.h:config.in)
+AC_CONFIG_HEADERS([config.h:config.in])
 
 AC_USE_SYSTEM_EXTENSIONS
 
@@ -737,4 +737,5 @@ AM_LC_MESSAGES
 
 AM_MAINTAINER_MODE
 
-AC_OUTPUT(Makefile testsuite/Makefile po/Makefile.in:po/Make-in)
+AC_CONFIG_FILES([Makefile testsuite/Makefile po/Makefile.in:po/Make-in])
+AC_OUTPUT