Port to glibc 2.43+ with GCC 15+

Port to planned glibc 2.43 (scheduled for February 2026),
which will support qualifier-generic standard functions; see:
https://sourceware.org/git/?p=glibc.git;a=commit;h=cd748a63ab1a7ae846175c532a3daab341c62690
For example, strchr (P, C) will return pointer to const if P is
pointer to const.  The idea is to catch dumb programming errors when a
program mistakenly uses strchr to convert a pointer to const
to an unrestricted pointer.  This feature is required by C23,
and will be enabled by default in GCC 15.
* src/callint.c (Fcall_interactively):
Respect constness of pointer when calling memchr.
* src/gtkutil.c (xg_get_font):
2nd arg is char *, not const char *.
* src/xfaces.c (parse_float_color_comp): Return bool, not double.
New arg DST.  All callers changed.  This makes it easier for
callers to use char const *.
(parse_color_spec): Respect constness of pointer when calling strchr.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gtkutil.h b/src/gtkutil.h
index cabf88da73f..e6c1e19c765 100644
--- a/src/gtkutil.h
+++ b/src/gtkutil.h
@@ -91,7 +91,7 @@ extern char *xg_get_file_name (struct frame *f,
                                bool mustmatch_p,
                                bool only_dir_p);
 
-extern Lisp_Object xg_get_font (struct frame *f, const char *);
+extern Lisp_Object xg_get_font (struct frame *f, char *);
 
 extern GtkWidget *xg_create_widget (const char *type,
                                     const char *name,