Bug 1225926

GCC 14 newly by default treats as errors a number of situations which
before were only warnings.  For more information see
https://gcc.gnu.org/gcc-14/porting_to.html and meta bug #1220571.

Because of this, package seahorse fails to compile.  This can be seen online
at:
https://build.opensuse.org/package/live_build_log/openSUSE:Factory:Staging:Gcc7/seahorse/standard/x86_64

It can be reproduced locally with command: osc build --clean
--alternative-project home:rguenther:nextgcc

Related Fedora notes (with a patch for a C99 issue):
https://gitlab.com/fweimer-rh/fedora-modernc/-/blob/main/pkg/s/seahorse.md?ref_type=heads


The (first) error (that halts the build) is:

[   19s] In file included from /usr/include/glib-2.0/glib.h:64,
[   19s]                  from /usr/include/glib-2.0/gobject/gbinding.h:30,
[   19s]                  from /usr/include/glib-2.0/glib-object.h:24,
[   19s]                  from /usr/include/glib-2.0/gio/gioenums.h:30,
[   19s]                  from /usr/include/glib-2.0/gio/giotypes.h:30,
[   19s]                  from /usr/include/glib-2.0/gio/gio.h:28,
[   19s]                  from common/seahorse-common.h:6,
[   19s]                  from ssh/seahorse-ssh.h:6,
[   19s]                  from ssh/libseahorse-ssh.a.p/operation.c:25:
[   19s] ssh/libseahorse-ssh.a.p/operation.c: In function ‘seahorse_ssh_operation_operation_async_co’:
[   19s] /usr/include/glib-2.0/glib/gmessages.h:671:16: error: returning ‘void *’ from a function with return type ‘gboolean’ {aka ‘int’} makes integer from pointer without a cast [-Wint-conversion]
[   19s]   671 |         return (val); \
[   19s]       |                ^