Revert "[CMake][libunwind] Use -nodefaultlibs for CMake checks"

This reverts commit r299796.

llvm-svn: 299798
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: df82d93562591fd948d15669703610b62becaffe
1 file changed