Change mbtk toolchain to glibc.

Change-Id: I7346dfcca3bb3ff9f586cfafc09d04f16b6d2518
diff --git a/mbtk/Make.defines b/mbtk/Make.defines
index 2ce3c80..5fa7caf 100755
--- a/mbtk/Make.defines
+++ b/mbtk/Make.defines
@@ -18,8 +18,8 @@
 CC=$(BUILD_TOOLCHAIN_DIR)/bin/arm-openwrt-linux-muslgnueabi-gcc

 AR=$(BUILD_TOOLCHAIN_DIR)/bin/arm-openwrt-linux-muslgnueabi-ar

 else ifeq ($(BUILD_PLATFORM), gcc-8.4)

-CC=$(BUILD_TOOLCHAIN_DIR)/bin/arm-openwrt-linux-muslgnueabi-gcc

-AR=$(BUILD_TOOLCHAIN_DIR)/bin/arm-openwrt-linux-muslgnueabi-ar

+CC=$(BUILD_TOOLCHAIN_DIR)/bin/arm-openwrt-linux-gnueabi-gcc

+AR=$(BUILD_TOOLCHAIN_DIR)/bin/arm-openwrt-linux-gnueabi-ar

 else

 CC=gcc

 AR=ar