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

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

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

[  140s]  1:25.51 /home/abuild/rpmbuild/BUILD/firefox-127.0.2/media/ffvpx/libavcodec/av1dec.c: In function ‘av1_decode_i
nit’:
[  140s]  1:25.51 /home/abuild/rpmbuild/BUILD/firefox-127.0.2/media/ffvpx/libavcodec/av1dec.c:890:20: error: assignment
to ‘AVContext *’ {aka ‘struct AVCtx *’} from incompatible pointer type ‘AVCodecContext *’ [-Wincompatible-pointer-types]
[  140s]  1:25.51   890 |     s->dovi.logctx = avctx;
[  140s]  1:25.51       |                    ^