[CMake] lld: Introduce ${cmake_2_8_12_INTERFACE} onto each target_link_libraries. [PR20254]

FIXME: Dependencies should be reorganized.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@220000 91177308-0d34-0410-b5e6-96231b3b80d8