Remove puts_debug

I noticed that puts_debug isn't used in the tree.  git log tells me
that the last use was removed in 2015:

    commit 40e0b27177e747600d3ec186458fe0e482a1cf77
    Author: Pedro Alves <palves@redhat.com>
    Date:   Mon Aug 24 15:40:26 2015 +0100

	Delete the remaining ROM monitor targets

... and this commit mentions that the code being removed here probably
hadn't worked for 6 years prior to that.

Based on this, I'm removing puts_debug.  I don't think it's useful.
Tested by rebuilding.

2 files changed, 0 insertions, 87 deletions

diff --git a/gdb/utils.c b/gdb/utils.c
index ea0f65c..7d27f9b 100644
--- a/gdb/utils.c
+++ b/gdb/utils.c
@@ -2041,91 +2041,6 @@ fputc_filtered (int c, struct ui_file *stream)
   return c;
 }
 
-/* puts_debug is like fputs_unfiltered, except it prints special
-   characters in printable fashion.  */
-
-void
-puts_debug (char *prefix, char *string, char *suffix)
-{
-  int ch;
-
-  /* Print prefix and suffix after each line.  */
-  static int new_line = 1;
-  static int return_p = 0;
-  static const char *prev_prefix = "";
-  static const char *prev_suffix = "";
-
-  if (*string == '\n')
-    return_p = 0;
-
-  /* If the prefix is changing, print the previous suffix, a new line,
-     and the new prefix.  */
-  if ((return_p || (strcmp (prev_prefix, prefix) != 0)) && !new_line)
-    {
-      fputs_unfiltered (prev_suffix, gdb_stdlog);
-      fputs_unfiltered ("\n", gdb_stdlog);
-      fputs_unfiltered (prefix, gdb_stdlog);
-    }
-
-  /* Print prefix if we printed a newline during the previous call.  */
-  if (new_line)
-    {
-      new_line = 0;
-      fputs_unfiltered (prefix, gdb_stdlog);
-    }
-
-  prev_prefix = prefix;
-  prev_suffix = suffix;
-
-  /* Output characters in a printable format.  */
-  while ((ch = *string++) != '\0')
-    {
-      switch (ch)
-	{
-	default:
-	  if (gdb_isprint (ch))
-	    fputc_unfiltered (ch, gdb_stdlog);
-
-	  else
-	    fprintf_unfiltered (gdb_stdlog, "\\x%02x", ch & 0xff);
-	  break;
-
-	case '\\':
-	  fputs_unfiltered ("\\\\", gdb_stdlog);
-	  break;
-	case '\b':
-	  fputs_unfiltered ("\\b", gdb_stdlog);
-	  break;
-	case '\f':
-	  fputs_unfiltered ("\\f", gdb_stdlog);
-	  break;
-	case '\n':
-	  new_line = 1;
-	  fputs_unfiltered ("\\n", gdb_stdlog);
-	  break;
-	case '\r':
-	  fputs_unfiltered ("\\r", gdb_stdlog);
-	  break;
-	case '\t':
-	  fputs_unfiltered ("\\t", gdb_stdlog);
-	  break;
-	case '\v':
-	  fputs_unfiltered ("\\v", gdb_stdlog);
-	  break;
-	}
-
-      return_p = ch == '\r';
-    }
-
-  /* Print suffix if we printed a newline.  */
-  if (new_line)
-    {
-      fputs_unfiltered (suffix, gdb_stdlog);
-      fputs_unfiltered ("\n", gdb_stdlog);
-    }
-}
-
-
 /* Print a variable number of ARGS using format FORMAT.  If this
    information is going to put the amount written (since the last call
    to REINITIALIZE_MORE_FILTER or the last page break) over the page size,
diff --git a/gdb/utils.h b/gdb/utils.h
index f6fd32f..4d20ebd 100644
--- a/gdb/utils.h
+++ b/gdb/utils.h
@@ -447,8 +447,6 @@ extern void puts_unfiltered (const char *);
 
 extern void puts_filtered_tabular (char *string, int width, int right);
 
-extern void puts_debug (char *prefix, char *string, char *suffix);
-
 extern void vprintf_filtered (const char *, va_list) ATTRIBUTE_PRINTF (1, 0);
 
 extern void vfprintf_filtered (struct ui_file *, const char *, va_list)