cmake: don't install config.h (v2)

This header is private and shouldn't be used by clients.

(This reverts r149540, reinstating r149496. False alarm.)



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149550 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed