lib/Header: Fix Visual Studio builds
lib/Header: Fix Visual Studio builds

Summary:
This is a follow up to r355253, which inadvertently broke Visual
Studio builds by trying to copy files from CMAKE_CFG_INTDIR.

See https://reviews.llvm.org/D58537#inline-532492

Reviewers: smeenai, vzakhari, phosek

Reviewed By: smeenai

Subscribers: mgorny, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D61054

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@359257 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang