To build x86 image, fix target assumption of "arm".

Change-Id: Ica552e9311e5b56782ffd1467861366762f7a1d4
diff --git a/build/Android.libart-compiler-llvm.mk b/build/Android.libart-compiler-llvm.mk
index 05b6080..56b8c68 100644
--- a/build/Android.libart-compiler-llvm.mk
+++ b/build/Android.libart-compiler-llvm.mk
@@ -101,7 +101,7 @@
 
   ifeq ($$(art_target_or_host),target)
     LOCAL_STATIC_LIBRARIES += \
-      $$(libart_compiler_llvm_arm_STATIC_LIBRARIES)
+      $$(libart_compiler_llvm_$(TARGET_ARCH)_STATIC_LIBRARIES)
   else
     LOCAL_STATIC_LIBRARIES += \
       $$(libart_compiler_llvm_arm_STATIC_LIBRARIES) \