Use bundled FFmpeg for Debian stretch

System FFmpeg does not work with Chromium 67, so use the bundled version
for now.

resources/config_bundles/debian_stretch/patch_order.list

@@ -1,7 +1,6 @@
 debian/disable/openh264.patch
 
 debian_stretch/system/vpx.patch
-debian_stretch/system/ffmpeg.patch
 debian_stretch/system/icu.patch
 
 opensuse/system-libdrm.patch

resources/packaging/debian/stretch/clean

@@ -10,9 +10,7 @@ third_party/re2/BUILD.gn
 third_party/icu/BUILD.gn
 third_party/flac/BUILD.gn
 third_party/zlib/BUILD.gn
-third_party/opus/BUILD.gn
 third_party/snappy/BUILD.gn
-third_party/ffmpeg/BUILD.gn
 third_party/libxml/BUILD.gn
 third_party/libdrm/BUILD.gn
 third_party/libpng/BUILD.gn

resources/packaging/debian/stretch/scripts/unbundle

@@ -23,7 +23,7 @@ def strip(path):
                 else:
                     os.remove(removal)
 
-keepers = ('openh264', 'libjpeg', 'harfbuzz-ng')
+keepers = ('openh264', 'libjpeg', 'harfbuzz-ng', 'ffmpeg', 'opus')
 
 # strip out regenerating files in each build
 def remove_file(path):

resources/patches/debian_stretch/system/ffmpeg.patch

@@ -1,23 +0,0 @@
-description: changes required to support ffmpeg 3.2 in stretch
-author: Michael Gilbert <mgilbert@debian.org>
-
---- a/media/ffmpeg/ffmpeg_common.cc
-+++ b/media/ffmpeg/ffmpeg_common.cc
-@@ -189,8 +189,6 @@ static VideoCodec CodecIDToVideoCodec(AV
-       return kCodecVP8;
-     case AV_CODEC_ID_VP9:
-       return kCodecVP9;
--    case AV_CODEC_ID_AV1:
--      return kCodecAV1;
-     default:
-       DVLOG(1) << "Unknown video CodecID: " << codec_id;
-   }
-@@ -213,8 +211,6 @@ AVCodecID VideoCodecToCodecID(VideoCodec
-       return AV_CODEC_ID_VP8;
-     case kCodecVP9:
-       return AV_CODEC_ID_VP9;
--    case kCodecAV1:
--      return AV_CODEC_ID_AV1;
-     default:
-       DVLOG(1) << "Unknown VideoCodec: " << video_codec;
-   }