Disable clang compiler to unblock bullhead system build.

See bug description for the many compilation errors.

BUG: 24172208
Change-Id: I4d7a7a0091bbf3500556f3cf5cfedd919227c862
(cherry picked from commit 312490750b71c6d6b640615b54bec4fafe99116d)
diff --git a/msm8992/libbt-vendor/Android.mk b/msm8992/libbt-vendor/Android.mk
index ee4c0b8..b09d2b6 100644
--- a/msm8992/libbt-vendor/Android.mk
+++ b/msm8992/libbt-vendor/Android.mk
@@ -20,6 +20,9 @@
 
 include $(CLEAR_VARS)
 
+# b/24172208 many files do not compile with clang/llvm yet.
+LOCAL_CLANG := false
+
 BDROID_DIR:= system/bt
 
 LOCAL_SRC_FILES := \