Package rubygem-rdiscount fails to build with GCC 14 because of
various C99 violations which previously just generated warning s but
which cause errors with GCC 14 by default.  For more information see
https://gcc.gnu.org/gcc-14/porting_to.html and meta bug #1220571.

BuildService failures are available online at:
https://build.opensuse.org/package/live_build_log/openSUSE:Factory:Staging:Gcc7/rubygem-rdiscount/standard/x86_64

The build with GCC 14 can now be tried locally with:
osc build --clean --alternative-project home:rguenther:nextgcc

The (first) error that stops the build is:

[   10s] gethopt.c:48:1: error: type of ‘val’ defaults to ‘int’ [-Wimplicit-int]
[   10s] gethopt.c: In function ‘gethopt’:
[   10s] gethopt.c:59:1: warning: old-style function definition [-Wold-style-definition]
[   10s]    59 | gethopt(ctx, opts, nropts)
[   10s]       | ^~~~~~~