Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/protoc-artifacts/build-protoc.sh

 #!/bin/bash
 
 # Builds protoc executable into target/protoc.exe
 # To be run from Maven.
 # Usage: build-protoc.sh <OS> <ARCH>
 # <OS> and <ARCH> are ${os.detected.name} and ${os.detected.arch} from os-maven-plugin
 OS=$1
 ARCH=$2
 
 if [[ $# < 2 ]]; then
@@ skipping 194 matching lines @@
 # And they don't work under Mac.
 if [[ "$OS" != osx ]]; then
   LDFLAGS="$LDFLAGS -static-libgcc -static-libstdc++ -s"
 fi
 
 export CXXFLAGS LDFLAGS
 
 TARGET_FILE=target/protoc.exe
 
 cd "$WORKING_DIR"/.. && ./configure $CONFIGURE_ARGS &&
-  cd src && make clean && make google/protobuf/stubs/pbconfig.h $MAKE_TARGET &&
+  cd src && make clean && make $MAKE_TARGET &&
   cd "$WORKING_DIR" && mkdir -p target &&
   (cp ../src/protoc $TARGET_FILE || cp ../src/protoc.exe $TARGET_FILE) ||
   exit 1
 
 if [[ "$OS" == osx ]]; then
   # Since Mac linker doesn't accept "-s", we need to run strip
   strip $TARGET_FILE || exit 1
 fi
 
 checkArch $TARGET_FILE && checkDependencies $TARGET_FILE