Resolve conflicts for functions introduced in Android API level 34.
* m4/posix_spawn.m4 (gl_POSIX_SPAWN_BODY): Test for
posix_spawn_file_actions_addchdir_np and
posix_spawn_file_actions_addfchdir_np using gl_CHECK_FUNCS_ANDROID
instead of AC_CHECK_FUNCS_ONCE.
* m4/posix_spawn_faction_addchdir.m4
(gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR): Test for
posix_spawn_file_actions_addchdir_np using gl_CHECK_FUNCS_ANDROID
instead of AC_CHECK_FUNCS_ONCE.
* m4/posix_spawn_faction_addfchdir.m4
(gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDFCHDIR): Test for
posix_spawn_file_actions_addfchdir_np using gl_CHECK_FUNCS_ANDROID
instead of AC_CHECK_FUNCS_ONCE.
* doc/glibc-functions/posix_spawn_file_actions_addchdir_np.texi: Mention
the Android API levels.
* doc/glibc-functions/posix_spawn_file_actions_addfchdir_np.texi:
Likewise.