Snippets for python:av 19.0.1 from Nix aarch64-darwin

Sourced from https://hydra.nixos.org/log/9pjyz98w2g21dr8xcwfsg7y6pvm2mzpf-python3.14-av-19.0.1.drv.

src/av/_cyutil.c:22883:50: warning: code will never be executed [-Wunreachable-code]

src/av/format.c:6792:50: warning: code will never be executed [-Wunreachable-code]
 6792 |     if (unlikely(__Pyx_PyUnicode_READY(s1) < 0)) goto bad;
      |                                                  ^~~~~~~~

src/av/codec/codec.c:11668:50: warning: code will never be executed [-Wunreachable-code]

src/av/container/core.c:14675:50: warning: code will never be executed [-Wunreachable-code]

src/av/container/input.c:5989:72: warning: comparison of integers of different signs: 'int' and 'unsigned int' [-Wsign-compare]
 5989 |       __pyx_t_18 = (__pyx_cur_scope->__pyx_v_read_packet->stream_index < __pyx_cur_scope->__pyx_v_nb_streams);
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/av/filter/graph.c:6190:62: warning: comparison of integers of different signs: 'int' and 'unsigned int' [-Wsign-compare]
 6190 |   for (__pyx_t_3 = __pyx_v_self->_nb_filters_seen; __pyx_t_3 < __pyx_t_2; __pyx_t_3+=1) {
      |                                                    ~~~~~~~~~ ^ ~~~~~~~~~