protobuf-c: fix x86 build fail

Signed-off-by: Luka Paulic <luka.paulic@sartura.hr>

libs/protobuf-c/patches/001-t-generated-code2-cxx-generate-packed-data-fix.patch

@@ -0,0 +1,13 @@
+Index: protobuf-c-1.3.1/t/generated-code2/cxx-generate-packed-data.cc
+===================================================================
+--- protobuf-c-1.3.1.orig/t/generated-code2/cxx-generate-packed-data.cc
++++ protobuf-c-1.3.1/t/generated-code2/cxx-generate-packed-data.cc
+@@ -998,7 +998,7 @@ static void dump_test_packed_repeated_en
+ static void dump_test_unknown_fields (void)
+ {
+   EmptyMess mess;
+-  const google::protobuf::Message::Reflection *reflection = mess.GetReflection();
++  const google::protobuf::Reflection *reflection = mess.GetReflection();
+   google::protobuf::UnknownFieldSet *fs = reflection->MutableUnknownFields(&mess);
+ 
+ #if GOOGLE_PROTOBUF_VERSION >= 2001000