Modify protobuf makefile not to build two same files
There are two common.cc files in Makefile, one should be removed.
@@ -126,8 +126,7 @@ CXXSRCS += src/google/protobuf/any.cc\
#
# protobuf_lite
#
-CXXSRCS += src/google/protobuf/stubs/common.cc\
- src/google/protobuf/arena.cc\
+CXXSRCS += src/google/protobuf/arena.cc\
src/google/protobuf/arenastring.cc\
src/google/protobuf/extension_set.cc\
src/google/protobuf/generated_message_table_driven_lite.cc\
