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