Remove the 'traverse_serial' fields which were added in 2.1.1.
Use the 'serial' field to track the current traversal.
Stop using 'identifier' to sort packages in the flattened solution.
Directly construct the flattened solution by a specific walk which
also preserves the relative order in Requires and Requires.private.
The topological sort is a single list, so don't fill requires_private.
Purely private dependencies are marked in dependency flags.
The ancestor flag is a pkg property, not a client property.
GCC 14 introduces a new -Walloc-size included in -Wextra which gives:
```
libpkgconf/personality.c:260:11: warning: allocation of insufficient size '1' for type 'pkgconf_cross_personality_t' {aka 'struct pkgconf_cross_personality_'} with size '48' [-Walloc-size]
libpkgconf/queue.c:46:33: warning: allocation of insufficient size '1' for type 'pkgconf_queue_t' {aka'struct pkgconf_queue_'} with size '16' [-Walloc-size]
libpkgconf/client.c:164:33: warning: allocation of insufficient size '1' for type 'pkgconf_client_t' {aka 'struct pkgconf_client_'} with size '120' [-Walloc-size]
libpkgconf/path.c:105:14: warning: allocation of insufficient size '1' for type 'pkgconf_path_t' {aka 'struct pkgconf_path_'} with size '24' [-Walloc-size]
libpkgconf/path.c:237:22: warning: allocation of insufficient size '1' for type 'pkgconf_path_t' {aka 'struct pkgconf_path_'} with size '24' [-Walloc-size]
libpkgconf/tuple.c:239:34: warning: allocation of insufficient size '1' for type 'pkgconf_tuple_t' {aka 'struct pkgconf_tuple_'} with size '24' [-Walloc-size]
libpkgconf/dependency.c:133:13: warning: allocation of insufficient size '1' for type 'pkgconf_dependency_t' {aka 'struct pkgconf_dependency_'} with size '44' [-Walloc-size]
libpkgconf/dependency.c:472:17: warning: allocation of insufficient size '1' for type 'pkgconf_dependency_t' {aka 'struct pkgconf_dependency_'} with size '44' [-Walloc-size]
libpkgconf/fragment.c:146:22: warning: allocation of insufficient size '1' for type 'pkgconf_fragment_t' {aka 'struct pkgconf_fragment_'} with size '24' [-Walloc-size]
libpkgconf/fragment.c:195:22: warning: allocation of insufficient size '1' for type 'pkgconf_fragment_t' {aka 'struct pkgconf_fragment_'} with size '24' [-Walloc-size]
libpkgconf/fragment.c:356:14: warning: allocation of insufficient size '1' for type 'pkgconf_fragment_t' {aka 'struct pkgconf_fragment_'} with size '24' [-Walloc-size]
libpkgconf/pkg.c:422:13: warning: allocation of insufficient size '1' for type 'pkgconf_pkg_t' {aka 'struct pkgconf_pkg_'} with size '188' [-Walloc-size]
libpkgconf/client.c:164:33: warning: allocation of insufficient size '1' for type 'pkgconf_client_t' {aka 'struct pkgconf_client_'} with size '224' [-Walloc-size]
libpkgconf/personality.c:260:11: warning: allocation of insufficient size '1' for type 'pkgconf_cross_personality_t' {aka 'struct pkgconf_cross_personality_'} with size '96' [-Walloc-size]
libpkgconf/dependency.c:133:13: warning: allocation of insufficient size '1' for type 'pkgconf_dependency_t' {aka 'struct pkgconf_dependency_'} with size '80' [-Walloc-size]
libpkgconf/dependency.c:472:17: warning: allocation of insufficient size '1' for type 'pkgconf_dependency_t' {aka 'struct pkgconf_dependency_'} with size '80' [-Walloc-size]
libpkgconf/path.c:105:14: warning: allocation of insufficient size '1' for type 'pkgconf_path_t' {aka 'struct pkgconf_path_'} with size '48' [-Walloc-size]
libpkgconf/path.c:237:22: warning: allocation of insufficient size '1' for type 'pkgconf_path_t' {aka 'struct pkgconf_path_'} with size '48' [-Walloc-size]
libpkgconf/queue.c:46:33: warning: allocation of insufficient size '1' for type 'pkgconf_queue_t' {aka 'struct pkgconf_queue_'} with size '32' [-Walloc-size]
libpkgconf/tuple.c:239:34: warning: allocation of insufficient size '1' for type 'pkgconf_tuple_t' {aka 'struct pkgconf_tuple_'} with size '48' [-Walloc-size]
libpkgconf/fragment.c:146:22: warning: allocation of insufficient size '1' for type 'pkgconf_fragment_t' {aka 'struct pkgconf_fragment_'} with size '48' [-Walloc-size]
libpkgconf/fragment.c:195:22: warning: allocation of insufficient size '1' for type 'pkgconf_fragment_t' {aka 'struct pkgconf_fragment_'} with size '48' [-Walloc-size]
libpkgconf/fragment.c:356:14: warning: allocation of insufficient size '1' for type 'pkgconf_fragment_t' {aka 'struct pkgconf_fragment_'} with size '48' [-Walloc-size]
libpkgconf/pkg.c:422:13: warning: allocation of insufficient size '1' for type 'pkgconf_pkg_t' {aka 'struct pkgconf_pkg_'} with size '360' [-Walloc-size]
```
The calloc prototype is:
```
void *calloc(size_t nmemb, size_t size);
```
So, just swap the number of members and size arguments to match the prototype, as
we're initialising 1 struct of size `sizeof(struct ...)`. GCC then sees we're not
doing anything wrong.
The only exception there is for argv which I fixed while at it.
Signed-off-by: Sam James <sam@gentoo.org>