Remove Module.markers and Module.symver{s} in clean target

Split 'modules' and 'clean' Makefile targets to allow us to
cleanly remove the Module.* build products with a 'make clean'.

module/Makefile.in

@@ -3,9 +3,14 @@ subdir-m += splat
 
 INSTALL=/usr/bin/install
 
-modules clean:
+modules:
 	$(MAKE) -C @LINUX_OBJ@ SUBDIRS=`pwd` @KERNELMAKE_PARAMS@ $@
 
+clean:
+	$(MAKE) -C @LINUX_OBJ@ SUBDIRS=`pwd` @KERNELMAKE_PARAMS@ $@
+	if [ -f @LINUX_SYMBOLS@ ]; then $(RM) @LINUX_SYMBOLS@; fi
+	if [ -f Module.markers ]; then $(RM) Module.markers; fi
+
 modules_install:
 	$(MAKE) -C @LINUX_OBJ@ SUBDIRS=`pwd` \
 		INSTALL_MOD_PATH=$(DESTDIR) \