Prevent vendor libs from depending on private VNDK libraries

For module installed to /vendor partition, direct linking to the libs
marked as `vendor_available: false` is not allowed. The

Bug: 64730695
Test: Add vendor_available: false to libft2 and
libcompiler_rt. Add the two libs into LOCAL_SHARED_LIBRARIES of a vendor
lib (e.g. libdrm). Build fails with the link_type check error message.

Change-Id: Iaf23574ceddb0c087111e1d95997e9ddd60cdf87
diff --git a/core/prebuilt_internal.mk b/core/prebuilt_internal.mk
index f515230..5dc4602 100644
--- a/core/prebuilt_internal.mk
+++ b/core/prebuilt_internal.mk
@@ -155,7 +155,16 @@
 ifdef LOCAL_SDK_VERSION
 my_link_type := native:ndk
 else ifdef LOCAL_USE_VNDK
-my_link_type := native:vendor
+    _name := $(patsubst %.vendor,%,$(LOCAL_MODULE))
+    ifneq ($(filter $(_name),$(VNDK_CORE_LIBRARIES) $(VNDK_SAMEPROCESS_LIBRARIES) $(LLNDK_LIBRARIES)),)
+        ifeq ($(filter $(_name),$(VNDK_PRIVATE_LIBRARIES)),)
+            my_link_type := native:vndk
+        else
+            my_link_type := native:vndk_private
+        endif
+    else
+        my_link_type := native:vendor
+    endif
 else
 my_link_type := native:platform
 endif