Fix build errors when rtc_use_builtin_sw_codecs is set to false.

The previous effort of building WebRTC without SW codecs stopped when
libjingle_peerconnection was possible to build. In order to make the
group("default") target build, this basically updates a bunch of
tests to explicitly depend on the built-in software video codecs.

Bug: webrtc:7925
Change-Id: I2715414770c197fca01cb8dbde173a21f4434500
Reviewed-on: https://webrtc-review.googlesource.com/70503
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Commit-Queue: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23216}

modules/video_coding/BUILD.gn

@@ -739,6 +739,7 @@ if (rtc_include_tests) {
       "../../api/video_codecs:video_codecs_api",
       "../../common_video",
       "../../media:rtc_h264_profile_id",
+      "../../media:rtc_internal_video_codecs",
       "../../media:rtc_media_base",
       "../../rtc_base:rtc_base",
       "../../test:fileutils",
@@ -822,6 +823,7 @@ if (rtc_include_tests) {
     if (rtc_use_h264) {
       sources += [ "codecs/h264/h264_encoder_impl_unittest.cc" ]
     }
+
     deps = [
       ":codec_globals_headers",
       ":encoded_frame",