cvtFastPerform measures performance, it doesn't do functional testing.

* Cleaned up some warning messages in it on darwin
* Removed it from the epicsRunLibComTests function.

src/libCom/test/cvtFastPerform.cpp

@@ -18,6 +18,7 @@ typedef void ( * PTestFunc ) ( const double &, char * pBug, size_t bufSize );
 class Test {
 public:
     Test ();
+    virtual ~Test ();
     void execute ();
 protected:
     char _pDst[128];
@@ -48,6 +49,10 @@ Test ::
 {
 }
 
+Test :: ~Test () 
+{
+}
+
 void Test :: execute ()
 {
     static const unsigned lowPrecision = 2;