fix 2nd target clang prebuilt paths

Change-Id: I4c196221bd377e30bbff1aafa265952e29c85cb5
diff --git a/core/clang/TARGET_arm.mk b/core/clang/TARGET_arm.mk
index 373f276..f32bbfb 100644
--- a/core/clang/TARGET_arm.mk
+++ b/core/clang/TARGET_arm.mk
@@ -3,7 +3,7 @@
 
 CLANG_CONFIG_arm_TARGET_TRIPLE := arm-linux-androideabi
 CLANG_CONFIG_arm_TARGET_TOOLCHAIN_PREFIX := \
-  $(TARGET_TOOLCHAIN_ROOT)/$(CLANG_CONFIG_arm_TARGET_TRIPLE)/bin
+  $($(clang_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT)/$(CLANG_CONFIG_arm_TARGET_TRIPLE)/bin
 
 CLANG_CONFIG_arm_TARGET_EXTRA_ASFLAGS := \
   $(CLANG_CONFIG_EXTRA_ASFLAGS) \