verbs: fix typo

(cherry picked from commit open-mpi/ompi@d812695)

Author: jsquyres

ompi/mca/common/verbs/common_verbs_basics.c

@@ -21,7 +21,7 @@
 #include <unistd.h>
 #endif
 
-#if OPAL_COMMON_VERSION_USNIC_HAPPY
+#if OPAL_COMMON_VERBS_USNIC_HAPPY
 #include "ompi/mca/common/verbs_usnic/common_verbs_usnic.h"
 #endif