Revert "fixes duplicate header installation"

This reverts commit 0bd40d6c3da6719fecf77038673d453ff1eab25b.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@210857 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed