runtime: remove unused variable

This variable is unused apparently as a result of local changes.
gccgo accepts this variable declaration, but other frontends may not.

From-SVN: r212873

libgo/go/reflect/value.go

@@ -436,11 +436,10 @@ func (v Value) call(op string, in []Value) []Value {
 	var (
 		fn   unsafe.Pointer
 		rcvr Value
-		rcvrtype *rtype
 	)
 	if v.flag&flagMethod != 0 {
 		rcvr = v
-		rcvrtype, t, fn = methodReceiver(op, v, int(v.flag)>>flagMethodShift)
+		_, t, fn = methodReceiver(op, v, int(v.flag)>>flagMethodShift)
 	} else if v.flag&flagIndir != 0 {
 		fn = *(*unsafe.Pointer)(v.ptr)
 	} else {