Fix the description of FileSpec::Resolve to match the new signature.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@215158 91177308-0d34-0410-b5e6-96231b3b80d8
r215124 missed a few Mac OS X only uses of FileSpec::Resolve, fixing to match
the new signature.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@215159 91177308-0d34-0410-b5e6-96231b3b80d8