[bpf] support BPF backend as shared library

dependencies were not set correctly for shared library build.
static was ok

Patch by Brenden Blanco.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234386 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed