Link tdesktop with external_webrtc.

.gitmodules

@@ -94,3 +94,6 @@
 [submodule "Telegram/ThirdParty/fcitx5-qt"]
 	path = Telegram/ThirdParty/fcitx5-qt
 	url = https://github.com/fcitx/fcitx5-qt.git
+[submodule "Telegram/lib_webrtc"]
+	path = Telegram/lib_webrtc
+	url = https://github.com/desktop-app/lib_webrtc.git

Telegram/CMakeLists.txt

@@ -18,6 +18,7 @@ endif()
 add_subdirectory(lib_storage)
 add_subdirectory(lib_lottie)
 add_subdirectory(lib_qr)
+add_subdirectory(lib_webrtc)
 add_subdirectory(codegen)
 
 include(CheckCXXSourceCompiles)
@@ -111,6 +112,7 @@ PRIVATE
     desktop-app::lib_tl
     desktop-app::lib_storage
     desktop-app::lib_lottie
+    desktop-app::lib_webrtc
     desktop-app::lib_qr
     desktop-app::lib_ffmpeg
     desktop-app::external_lz4