THRIFT-3383 i64 related warnings

This closes #764
diff --git a/lib/c_glib/test/testoptionalrequired.c b/lib/c_glib/test/testoptionalrequired.c
index cfc96a2..60d8afd 100755
--- a/lib/c_glib/test/testoptionalrequired.c
+++ b/lib/c_glib/test/testoptionalrequired.c
@@ -201,7 +201,7 @@
   g_assert(!error);
   write_to_read (THRIFT_STRUCT (b2), THRIFT_STRUCT (b1), NULL, &error);
   g_assert(!error);
-  // OK. No segfault
+  /* OK. No segfault */
 
   g_object_unref (b1);
   g_object_unref (b2);