Tests: Skip RunCMake.file INSTALL-FOLLOW_SYMLINK_CHAIN case on Cygwin
This case was added by !3332 (merged).
Skip it on Cygwin because it fails due to foo/../
pairs being
flattened away in symlinks.
This case was added by !3332 (merged).
Skip it on Cygwin because it fails due to foo/../
pairs being
flattened away in symlinks.