Snippets for ffmpeg 9.0.1 from Nix aarch64-darwin

Sourced from https://hydra.nixos.org/log/vl1sxhjsgs38li0cysrmk2py117k7xdv-ffmpeg-9.0.1.drv.

• libavfilter/vf_mcdeint.c:144:5: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
    144 |     case MODE_SLOW:
        |     ^
  

• libavfilter/vf_mcdeint.c:146:5: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
    146 |     case MODE_MEDIUM:
        |     ^
  

• libavfilter/vf_mcdeint.c:149:5: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
    149 |     case MODE_FAST:
        |     ^
  

• libavutil/hwcontext_opencl.c:2217:28: warning: unused function 'opencl_mem_flags_for_mapping' [-Wunused-function]
   2217 | static inline cl_mem_flags opencl_mem_flags_for_mapping(int map_flags)
        |                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
  

• libavformat/jvdec.c:185:9: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
    185 |         case JV_VIDEO:
        |         ^
  

• libavformat/jvdec.c:209:9: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
    209 |         case JV_PADDING:
        |         ^
  

• libavformat/nspdec.c:81:9: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
     81 |         case MKBETAG('S', 'D', 'A', '_'):
        |         ^
  

• libavformat/nuv.c:279:9: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
    279 |         case NUV_VIDEO:
        |         ^
  

• libavcodec/lcevc_parser.c:192:9: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
    192 |         case LCEVC_NON_IDR_NUT:
        |         ^
  

• libavcodec/qdm2_tablegen.h:120:30: warning: passing 'const uint8_t *' (aka 'const unsigned char *') to parameter of type 'const int8_t *' (aka 'const signed char *') converts between pointers to integer types with different sign [-Wpointer-sign]
    120 |                              &tab[0][1], 2, &tab[0][0], 2, 1,
        |                              ^~~~~~~~~~
  

• fftools/ffplay.c:3579:9: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
   3579 |         case SDL_MOUSEMOTION:
        |         ^
  

• fftools/ffplay.c:3630:17: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
   3630 |                 case SDL_WINDOWEVENT_EXPOSED:
        |                 ^
  

• tools/seek_print.c:56:9: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
     56 |         default:
        |         ^