pxa: mark as broken

It still uses the long obsolete 3.3 kernel version

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@44108 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/pxa/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 ARCH:=arm
 BOARD:=pxa
 BOARDNAME:=Marvell/Intel PXA2xx
-FEATURES:=squashfs
+FEATURES:=squashfs broken
 MAINTAINER:=Imre Kaloz <kaloz@openwrt.org>
 
 KERNEL_PATCHVER:=3.3