no need to mess with KBUILD_CFLAGS on uml-i386 anymore

Now that X86_32 is provided on Kconfig level for uml-i386, there's no
need to play with it explicitly on Makefile level anymore.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/um/Makefile-i386

@@ -22,11 +22,6 @@ export LDFLAGS HOSTCFLAGS HOSTLDFLAGS UML_OBJCOPYFLAGS
 endif
 endif
 
-KBUILD_CFLAGS		+= -DCONFIG_X86_32
-KBUILD_AFLAGS		+= -DCONFIG_X86_32
-CONFIG_X86_32		:= y
-export CONFIG_X86_32
-
 # First of all, tune CFLAGS for the specific CPU. This actually sets cflags-y.
 include $(srctree)/arch/x86/Makefile_32.cpu