ossfuzz: Fix mruby include paths

oss-fuzz/mruby_proto_fuzzer.cpp

@@ -5,8 +5,8 @@
 #include <mruby.h>
 #include <mruby/compile.h>
 
-#include "libprotobuf-mutator/src/libfuzzer/libfuzzer_macro.h"
-#include "ruby.pb.h"
+#include <src/libfuzzer/libfuzzer_macro.h>
+#include <ruby.pb.h>
 #include "proto_to_ruby.h"
 
 using namespace ruby_fuzzer;

oss-fuzz/proto_to_ruby.h

@@ -4,7 +4,7 @@
 #include <ostream>
 #include <sstream>
 #include <stack>
-#include "ruby.pb.h"
+#include <ruby.pb.h>
 
 namespace ruby_fuzzer {
 	class protoConverter