Enhance .file_path_relative_to_dir().

git-svn-id: https://svn.r-project.org/R/trunk@66520 00db46b3-68df-0310-9c12-caf00c1e9a41
Use relative file paths for check so files results.

git-svn-id: https://svn.r-project.org/R/trunk@66521 00db46b3-68df-0310-9c12-caf00c1e9a41
New mirror in Chungli, Taiwan.

git-svn-id: https://svn.r-project.org/R/trunk@66522 00db46b3-68df-0310-9c12-caf00c1e9a41