[libc++abi] Actually set POSITION_INDEPENDENT_CODE when building shared library
[libc++abi] Actually set POSITION_INDEPENDENT_CODE when building shared library

This is a bug fix from https://reviews.llvm.org/D60005.

Differential Revision: https://reviews.llvm.org/D60158

git-svn-id: 6a9f6578bdee8d959f0ed58970538b4ab6004734@357550 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/libcxxabi,llvm-mirror/libcxxabi,llvm-mirror/libcxxabi,llvm-mirror/libcxxabi,llvm-mirror/libcxxabi