make clean ARCH=um does not remove the generated file
arch/um/include/user_constants.h, fix this.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
 #When cleaning we don't include .config, so we don't include
 #TT or skas makefiles and don't clean skas_ptregs.h.
 CLEAN_FILES += linux x.i gmon.out $(ARCH_DIR)/include/uml-config.h \
-       $(GEN_HEADERS) $(ARCH_DIR)/include/skas_ptregs.h
+       $(GEN_HEADERS) $(ARCH_DIR)/include/skas_ptregs.h \
+       $(ARCH_DIR)/include/user_constants.h
 
 MRPROPER_FILES += $(SYMLINK_HEADERS) $(ARCH_SYMLINKS) \
        $(addprefix $(ARCH_DIR)/kernel/,$(KERN_SYMLINKS)) $(ARCH_DIR)/os \