build: enable MIPS16 again, but make it depend on !gcc-4.6

gcc 4.6 miscompiles hostapd with mips16, on gcc 4.8 it works

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 37932

Config.in

@@ -879,6 +879,8 @@ menuconfig TARGET_OPTIONS
 	config USE_MIPS16
 		bool "Build packages with MIPS16 instructions" if TARGET_OPTIONS
 		depends on HAS_MIPS16
+		depends on !GCC_VERSION_4_6
+		default y
 		help
 		  If your target CPU does support the MIPS16 instruction set
 		  and you want to use it for packages, enable this option.