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

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

There are possibly relevant Gentoo bugs https://bugs.gentoo.org/869980
and https://bugs.gentoo.org/919066


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

[   15s] /home/abuild/rpmbuild/BUILD/zziplib-0.13.72/zzip/mmapped.c: In
function ‘zzip_disk_entry_fopen’:
[   15s] /home/abuild/rpmbuild/BUILD/zziplib-0.13.72/zzip/fetch.h:232:41:
error: initialization of ‘off_t’ {aka ‘long int’} from ‘zzip_byte_t *’ {aka
‘unsigned char *’} makes integer from pointer without a cast [-Wint-conversion]
[   15s]   232 | #define zzip_file_header_to_data(__p)   ((zzip_byte_t*) \
[   15s]       |                                         ^
[   15s] /home/abuild/rpmbuild/BUILD/zziplib-0.13.72/zzip/mmapped.c:665:20:
note: in expansion of macro ‘zzip_file_header_to_data’
[   15s]   665 |     off_t offset = zzip_file_header_to_data(header);
[   15s]       |                    ^~~~~~~~~~~~~~~~~~~~~~~~