uml: keep UML Kconfig in sync with x86

Fix a UML build breakage introduced by commit
1032c0ba9da5c5b53173ad2dcf8b2a2da78f8b17 - it introduces X86_32, with many
things which UML needs depending on it.

This patch adds definitions of X86_32 and RWSEM_XCHGADD_ALGORITHM to
the UML/i386 Kconfig.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/um/Kconfig.i386 b/arch/um/Kconfig.i386
index e0ac74e..717f5d3 100644
--- a/arch/um/Kconfig.i386
+++ b/arch/um/Kconfig.i386
@@ -8,6 +8,13 @@
 	bool
 	default y
 
+config X86_32
+       bool
+       default y
+
+config RWSEM_XCHGADD_ALGORITHM
+	def_bool y
+
 config 64BIT
 	bool
 	default n