fix Android libwebrtc builds (#791)

* webrtc-builds: clear disk space for Android builds

This fixes Android builds that were failing due to running out
of space when cloning libwebrtc's enormous git repositories.

* build_android.sh: do not copy non-existent desktop_capture.ninja

libwebrtc's desktop_capture module does not support Android.

Author: Be-ing

.github/workflows/webrtc-builds.yml

@@ -161,6 +161,18 @@ jobs:
         shell: bash
         working-directory: webrtc-sys/libwebrtc
 
+      - name: Free Disk Space (Ubuntu)
+        uses: jlumbroso/free-disk-space@main
+        if: ${{ matrix.target.os == 'ubuntu-latest' }}
+        with:
+          android: false
+          tool-cache: true
+          dotnet: true
+          haskell: true
+          large-packages: true
+          docker-images: true
+          swap-storage: true
+
       - name: Build WebRTC
         run: ${{ matrix.target.cmd }} --arch ${{ matrix.target.arch }} --profile ${{ matrix.profile }} ${{ matrix.target.buildargs }}
         working-directory: webrtc-sys/libwebrtc

webrtc-sys/libwebrtc/build_android.sh

@@ -125,7 +125,6 @@ python3 "./src/tools_webrtc/libs/generate_licenses.py" \
   --target :default "$OUTPUT_DIR" "$OUTPUT_DIR"
 
 cp "$OUTPUT_DIR/obj/webrtc.ninja" "$ARTIFACTS_DIR"
-cp "$OUTPUT_DIR/obj/modules/desktop_capture/desktop_capture.ninja" "$ARTIFACTS_DIR"
 cp "$OUTPUT_DIR/libjingle_peerconnection_so.so" "$ARTIFACTS_DIR/lib"
 cp "$OUTPUT_DIR/args.gn" "$ARTIFACTS_DIR"
 cp "$OUTPUT_DIR/LICENSE.md" "$ARTIFACTS_DIR"