Disable host clang only if WITHOUT_HOST_CLANG is set

Bug: 13402154
Change-Id: Ib915e31106aeb2adf64f8fa5d008b34debc205d7
diff --git a/build/Android.common.mk b/build/Android.common.mk
index cc46146..f22eb37 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -95,7 +95,7 @@
 # Target builds use GCC by default.
 ART_TARGET_CLANG := false
 ART_HOST_CLANG := false
-ifneq ($(WITHOUT_CLANG),true)
+ifneq ($(WITHOUT_HOST_CLANG),true)
   # By default, host builds use clang for better warnings.
   ART_HOST_CLANG := true
 endif