Move M_RPC malloc type into XDR. Both RPC and XDR libraries use

this type, but since RPC depends on XDR (not vice versa) we need
it defined in XDR to make the module loadable without RPC.

Reviewed by:	rmacklem
Differential Revision:	https://reviews.freebsd.org/D24408

sys/rpc/rpc_prot.c

@@ -61,8 +61,6 @@ __FBSDID("$FreeBSD$");
 #include <rpc/clnt.h>
 #include <rpc/rpc_msg.h>
 
-MALLOC_DEFINE(M_RPC, "rpc", "Remote Procedure Call");
-
 #define assert(exp)	KASSERT(exp, ("bad arguments"))
 
 static enum clnt_stat accepted(enum accept_stat, struct rpc_err *);

sys/xdr/xdr.c

@@ -65,6 +65,8 @@ typedef u_quad_t        u_longlong_t;   /* ANSI unsigned long long type */
 #define XDR_FALSE	((long) 0)
 #define XDR_TRUE	((long) 1)
 
+MALLOC_DEFINE(M_RPC, "rpc", "Remote Procedure Call");
+
 /*
  * for unit alignment
  */