[CMake][LibWebRTC] Update 'libwebrtc' sources after 296961@main

[dpino]

1449e9b

[CMake][LibWebRTC] Update 'libwebrtc' sources after 296961@main
https://bugs.webkit.org/show_bug.cgi?id=295335

Reviewed by Philippe Normand.

Changeset 296961@main upgraded 'libwebrtc' to M138. After this change,
LibWebTC's CMake sources should be updated.

Additionally, this change also fixes a few build errors related to the
upgrade.

* Source/ThirdParty/libwebrtc/CMakeLists.txt:
* Source/ThirdParty/libwebrtc/Source/webrtc/call/rtp_config.cc:
* Source/ThirdParty/libwebrtc/Source/webrtc/common_audio/allocation_counter.cc:
* Source/WebCore/CMakeLists.txt:
* Source/WebCore/platform/mediastream/libwebrtc/gstreamer/GStreamerVideoDecoderFactory.cpp:
* Source/WebCore/platform/mediastream/libwebrtc/gstreamer/GStreamerVideoEncoderFactory.cpp:
* Source/WebKit/NetworkProcess/webrtc/LibWebRTCSocketClient.cpp:
(WebKit::LibWebRTCSocketClient::signalSentPacket):

Canonical link: https://commits.webkit.org/297018@main

46620b1

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	⏳ 🧪 win-tests
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	✅ 🛠 playstation
✅ 🛠 🧪 unsafe-merge	✅ 🛠 tv	✅ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash 46620b1)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	⏳ 🧪 win-tests
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	✅ 🛠 playstation
✅ 🛠 🧪 unsafe-merge	✅ 🛠 tv	✅ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 297018@main (1449e9b): https://commits.webkit.org/297018@main

Reviewed commits have been landed. Closing PR #47552 and removing active labels.