[PATCH] lost chunk of "uml: build cleanups"

A piece of the UML stubs patch got lost - it has
    Killed STUBS_CFLAGS - it's not needed and the only remaining use had been
    gratitious - it only polluted CFLAGS
in description and does remove it in arch/um/Makefile-x86_64, but forgets to
do the same in i386 counterpart.  Lost chunk follows:

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/Makefile-i386

@@ -27,7 +27,7 @@ export LDFLAGS HOSTCFLAGS HOSTLDFLAGS UML_OBJCOPYFLAGS
 endif
 endif
 
-CFLAGS += -U__$(SUBARCH)__ -U$(SUBARCH) $(STUB_CFLAGS)
+CFLAGS += -U__$(SUBARCH)__ -U$(SUBARCH)
 
 ifneq ($(CONFIG_GPROF),y)
 ARCH_CFLAGS += -DUM_FASTCALL