build: decouple the mips16 support flag from the toolchain

Add the flags from package.mk instead, and leave libc and gcc
unaffected.

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

SVN-Revision: 37770

toolchain/uClibc/common.mk

@@ -45,8 +45,6 @@ GEN_CONFIG=$(SCRIPT_DIR)/kconfig.pl -n \
 			$(if $(CONFIG_MIPS64_ABI),.$(subst ",,$(CONFIG_MIPS64_ABI)), \
 			$(if $(CONFIG_HAS_SPE_FPU),$(if $(wildcard $(CONFIG_DIR)/$(ARCH).e500),.e500)))))
 
-TARGET_CFLAGS := $(filter-out -mips16,$(TARGET_CFLAGS))
-
 CPU_CFLAGS = \
 	-funsigned-char -fno-builtin -fno-asm \
 	--std=gnu99 -ffunction-sections -fdata-sections \