Remove an unused RML tag (it isn't even used in the oshmem layer).

This commit was SVN r30749.

ompi/mca/rte/rte.h

@@ -223,9 +223,6 @@ BEGIN_C_DECLS
 
 #define OMPI_RML_PCONNECT_TAG                       OMPI_RML_TAG_BASE+13
 
-/* open shmem oob communication */
-#define OMPI_RML_TAG_SHMEM                          OMPI_RML_TAG_BASE+14
-
 #define OMPI_RML_TAG_DYNAMIC                        OMPI_RML_TAG_BASE+200
 
 /*