Add DISABLE_LLVM_DEVICE_BUILDS to libbcc.

Change-Id: Iaad7b2ea8eea6c89c1c1a3d0e145bbb7bf60c6b9
diff --git a/libbcc.sha1.mk b/libbcc.sha1.mk
index 6759dd1..1eff581 100644
--- a/libbcc.sha1.mk
+++ b/libbcc.sha1.mk
@@ -1,7 +1,7 @@
 #=====================================================================
 # Calculate SHA1 checksum for libbcc.so, libRS.so and libclcore.bc
 #=====================================================================
-
+ifneq (true,$(DISABLE_LLVM_DEVICE_BUILDS))
 include $(CLEAR_VARS)
 
 # not supported on 64-bit yet
@@ -48,3 +48,4 @@
 LOCAL_MODULE_TARGET_ARCH := $(LLVM_SUPPORTED_ARCH)
 
 include $(BUILD_SHARED_LIBRARY)
+endif
\ No newline at end of file