Fix 'llvm-config --libs' output.

Change the naming scheme for llvmc plugins so that they do not appear in
'llvm-config --libs' output.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62687 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed