Add protobuf support.

Author: Alexhuszagh

docker/android-system.sh

@@ -92,6 +92,9 @@ EOF
     python3 ./repo sync -c external/clang
     python3 ./repo sync -c external/compiler-rt
     python3 ./repo sync -c external/elfutils
+    if [[ "${major_version}" -ge 10 ]]; then
+        python3 ./repo sync -c external/golang-protobuf/proto
+    fi
     python3 ./repo sync -c external/jemalloc
     python3 ./repo sync -c external/libcxx
     python3 ./repo sync -c external/libcxxabi
@@ -151,11 +154,11 @@ EOF
     rm bionic/tests/libs/Android.bp
     rm bionic/tests/headers/Android.bp
     rm bionic/tests/headers/posix/Android.bp
-    set -e
 
     sed -i -z -e 's/cc_test {.*}//g' bionic/libc/malloc_debug/Android.bp
     sed -i -z -e 's/cc_test {.*}//g' bionic/libc/malloc_hooks/Android.bp
     sed -i -z -e 's/cc_test_host {.*}//g' bionic/tools/relocation_packer/Android.bp
+    set -e
 
     export ALLOW_MISSING_DEPENDENCIES=true