add missing configure check for setlocale.

This corresponds to upstream gcc commit d44aa3e3bf.

Author: autc04

gcc/libcpp/config.in

@@ -198,6 +198,9 @@
 /* Define to 1 if you have the `putc_unlocked' function. */
 #undef HAVE_PUTC_UNLOCKED
 
+/* Define to 1 if you have the `setlocale' function. */
+#undef HAVE_SETLOCALE
+
 /* Define to 1 if you can assemble SSE4 insns. */
 #undef HAVE_SSE4
 

gcc/libcpp/configure

@@ -5970,7 +5970,7 @@ _ACEOF
 
 
 
-for ac_func in clearerr_unlocked feof_unlocked   ferror_unlocked fflush_unlocked fgetc_unlocked fgets_unlocked   fileno_unlocked fprintf_unlocked fputc_unlocked fputs_unlocked   fread_unlocked fwrite_unlocked getchar_unlocked getc_unlocked   putchar_unlocked putc_unlocked
+for ac_func in clearerr_unlocked feof_unlocked   ferror_unlocked fflush_unlocked fgetc_unlocked fgets_unlocked   fileno_unlocked fprintf_unlocked fputc_unlocked fputs_unlocked   fread_unlocked fwrite_unlocked getchar_unlocked getc_unlocked   putchar_unlocked putc_unlocked setlocale
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
@@ -6194,7 +6194,7 @@ fi
 cat >>confdefs.h <<_ACEOF
 #define HAVE_DECL_PUTCHAR_UNLOCKED $ac_have_decl
 _ACEOF
-ac_fn_c_check_decl "$LINENO" "putc_unlocked" "ac_cv_have_decl_putc_unlocked" "$ac_includes_default"
+ac_fn_c_check_decl "$LINENO" "unlocked" "ac_cv_have_decl_putc_unlocked" "$ac_includes_default"
 if test "x$ac_cv_have_decl_putc_unlocked" = xyes; then :
   ac_have_decl=1
 else

gcc/libcpp/configure.ac

@@ -81,7 +81,7 @@ define(libcpp_UNLOCKED_FUNCS, clearerr_unlocked feof_unlocked dnl
   fileno_unlocked fprintf_unlocked fputc_unlocked fputs_unlocked dnl
   fread_unlocked fwrite_unlocked getchar_unlocked getc_unlocked dnl
   putchar_unlocked putc_unlocked)
-AC_CHECK_FUNCS(libcpp_UNLOCKED_FUNCS)
+AC_CHECK_FUNCS(libcpp_UNLOCKED_FUNCS setlocale)
 AC_CHECK_DECLS([abort, asprintf, basename(char *), errno, getopt, vasprintf])
 AC_CHECK_DECLS(m4_split(m4_normalize(libcpp_UNLOCKED_FUNCS)))