use threemas webrtc build (trial)

build.gradle

@@ -75,7 +75,7 @@ dependencies {
 
     implementation 'com.google.guava:guava:30.1.1-android'
     quicksyImplementation 'io.michaelrocks:libphonenumber-android:8.12.49'
-    implementation fileTree(include: ['libwebrtc-m99.aar'], dir: 'libs')
+    implementation 'ch.threema:webrtc-android:100.0.0'
 }
 
 ext {