Fix handling of remote or quoted filenames for the runfiles environment.
Fix handling of remote or quoted filenames for the runfiles environment.

We need to unquote quoted filenames, and can’t handle any remote filenames,
because external processes have no way to access them.

phst/rules_elisp,phst/rules_elisp,phst/rules_elisp,phst/rules_elisp,phst/rules_elisp