Changes to VT: Fixed compiler warning about unused variable when compiling on MacOS

This commit was SVN r26076.

ompi/contrib/vt/vt/vtlib/vt_pform_macos.c

@@ -63,7 +63,6 @@ void vt_pform_init()
   int    argmax;
   char*  procargs;
   size_t len;
-  int    hostid_retries;
 
   /* get timer resolution */
 #if TIMER == TIMER_GETTIMEOFDAY