[CMake] Support symlinks even with LLVM_INSTALL_TOOLCHAIN_ONLY

When LLVM_INSTALL_TOOLCHAIN_ONLY is used and LLVM_TOOLCHAIN_TOOLS
contains a tool which is a symlink, it would be ignored. This already
worked before but got broken in r282510.

Differential Revision: https://reviews.llvm.org/D25067

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282844 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed