toolchain/uClibc: NPTL needs i486+ for cmpxchgl instruction

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

toolchain/toolchain-buildroot/Config.in.2

@@ -102,6 +102,7 @@ choice
 		bool "Native POSIX Threading (NPTL)"
 	        select BR2_TOOLCHAIN_HAS_THREADS
 		depends on BR2_UCLIBC_VERSION_SNAPSHOT || BR2_UCLIBC_VERSION_0_9_32
+		depends on !BR2_x86_i386
 endchoice
 
 source "toolchain/elf2flt/Config.in"