Update Makefile to remove libprotobuf patches

It's a followup for the previous changes that updated emsdk version
and refreshed the build scripts. Testing confirms that patches for
the protobuf library sources are not necessary anymore, so I'm
updating this Makefile to remove the patching logic that was already
removed from all other places.

Signed-off-by: Mikhail Krinkin <[email protected]>

Author: krinkinmu

Makefile

@@ -12,11 +12,10 @@ proxy_wasm_intrinsics_lite.pb.h struct_lite.pb.h: proxy_wasm_intrinsics_lite.pro
 	protoc --cpp_out=. struct_lite.proto
 
 ${CPP_API}/libprotobuf.a ${CPP_API}/libprotobuf-lite.a:
-	rm -rf protobuf-wasm && git clone https://github.com/protocolbuffers/protobuf protobuf-wasm \
-	&& cd protobuf-wasm && git checkout v3.9.1 \
-	&& rm -rf wasm-patches && git clone https://github.com/kwonoj/protobuf-wasm wasm-patches \
-	&& cd wasm-patches && git checkout 4bba8b2f38b5004f87489642b6ca4525ae72fe7f \
-	&& cd .. && git apply wasm-patches/*.patch \
+	rm -rf protobuf-wasm \
+	&& git clone https://github.com/protocolbuffers/protobuf protobuf-wasm \
+	&& cd protobuf-wasm \
+	&& git checkout v3.9.1 \
 	&& ./autogen.sh \
 	&& emconfigure ./configure --disable-shared CXXFLAGS="-O3 -flto" \
 	&& emmake make \