Patch from Ross McFarland to compile with strict warnings

Summary: Use comment trick in params that are unused to prevent warnings

Reviewed By: dreiss

Test Plan: Generate C++ code and compile -W -Wall


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665469 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/cpp/src/concurrency/Util.h b/lib/cpp/src/concurrency/Util.h
index 3ebc0b1..29e3567 100644
--- a/lib/cpp/src/concurrency/Util.h
+++ b/lib/cpp/src/concurrency/Util.h
@@ -7,7 +7,9 @@
 #ifndef _THRIFT_CONCURRENCY_UTIL_H_
 #define _THRIFT_CONCURRENCY_UTIL_H_ 1
 
+#ifdef HAVE_CONFIG_H
 #include <config.h>
+#endif
 
 #include <assert.h>
 #include <stddef.h>