Package rubygem-grpc 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-grpc/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:

[   34s] rb_compression_options.c: In function ‘grpc_rb_compression_options_algorithm_value_to_name_internal’:
[   34s] rb_compression_options.c:301:56: error: passing argument 2 of ‘grpc_compression_algorithm_name’ from incompatible pointer type [-Wincompatible-pointer-types]
[   34s]   301 |   if (!grpc_compression_algorithm_name(internal_value, &algorithm_name)) {
[   34s]       |                                                        ^~~~~~~~~~~~~~~
[   34s]       |                                                        |
[   34s]       |                                                        char **
[   34s] In file included from rb_compression_options.c:29:
[   34s] /usr/include/grpc/compression.h:50:56: note: expected ‘const char **’ but argument is of type ‘char **’
[   34s]    50 |     grpc_compression_algorithm algorithm, const char** name);
[   34s]       |                                           ~~~~~~~~~~~~~^~~~