THRIFT-3246 Reduce the number of trivial warnings in Windows C++ CMake builds
Client: cpp
Patch: Ben Craig <bencraig@apache.org>

This closes #553
diff --git a/lib/cpp/test/concurrency/ThreadFactoryTests.h b/lib/cpp/test/concurrency/ThreadFactoryTests.h
index d7431a8..635c8a2 100644
--- a/lib/cpp/test/concurrency/ThreadFactoryTests.h
+++ b/lib/cpp/test/concurrency/ThreadFactoryTests.h
@@ -220,7 +220,7 @@
 
       try {
         monitor.wait(100);
-      } catch (TimedOutException& e) {
+      } catch (TimedOutException&) {
       }
 
       if (state == SynchStartTask::STARTED) {
@@ -257,7 +257,7 @@
         Synchronized s(monitor);
         try {
           monitor.wait(timeout);
-        } catch (TimedOutException& e) {
+        } catch (TimedOutException&) {
         }
       }
     }