emulators/rpcs3: unbreak after c204aaf79162

rpcs3/Emu/Cell/Modules/cellAtracXdec.cpp:114:33: error: use of undeclared identifier 'AV_CODEC_CAP_SUBFRAMES'

114 |         ensure(!(codec->capabilities & AV_CODEC_CAP_SUBFRAMES));
    |                                        ^

rpcs3/Emu/Cell/Modules/cellAtracXdec.cpp:159:16: error: use of undeclared identifier 'avcodec_close'

159 |         if (int err = avcodec_close(ctx); err)
    |                       ^