uclibc: enable linuxthreads for xtensa

linuxthreads is the only threading option for noMMU xtensa, enable it.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/uclibc/Config.in

@@ -64,7 +64,7 @@ choice
 	config BR2_PTHREADS_OLD
 		bool "linuxthreads (stable/old)"
 		select BR2_TOOLCHAIN_HAS_THREADS
-		depends on BR2_m68k || BR2_arm || BR2_armeb
+		depends on BR2_m68k || BR2_arm || BR2_armeb || BR2_xtensa
 
 	config BR2_PTHREADS_NATIVE
 		bool "Native POSIX Threading (NPTL)"