Bug 1738845 - Add webrtc configs for arm and ppc64 linux. r=mjf a=RyanVM

python/mozbuild/mozbuild/gn_processor.py

...ebrtc/api/adaptation/resource_adaptation_api_gn/moz.build

third_party/libwebrtc/api/array_view_gn/moz.build

third_party/libwebrtc/api/audio/aec3_config_gn/moz.build

third_party/libwebrtc/api/audio/aec3_factory_gn/moz.build

third_party/libwebrtc/api/audio/audio_frame_api_gn/moz.build

third_party/libwebrtc/api/audio/audio_mixer_api_gn/moz.build

third_party/libwebrtc/api/audio/echo_control_gn/moz.build

...ebrtc/api/audio_codecs/L16/audio_decoder_L16_gn/moz.build

...ebrtc/api/audio_codecs/L16/audio_encoder_L16_gn/moz.build

.../libwebrtc/api/audio_codecs/audio_codecs_api_gn/moz.build

...i/audio_codecs/builtin_audio_decoder_factory_gn/moz.build

...i/audio_codecs/builtin_audio_encoder_factory_gn/moz.build

...rtc/api/audio_codecs/g711/audio_decoder_g711_gn/moz.build

...rtc/api/audio_codecs/g711/audio_encoder_g711_gn/moz.build

...rtc/api/audio_codecs/g722/audio_decoder_g722_gn/moz.build

.../audio_codecs/g722/audio_encoder_g722_config_gn/moz.build

...rtc/api/audio_codecs/g722/audio_encoder_g722_gn/moz.build

...rtc/api/audio_codecs/ilbc/audio_decoder_ilbc_gn/moz.build

.../audio_codecs/ilbc/audio_encoder_ilbc_config_gn/moz.build