unmsys--file-name
unmsys--file-name is a compiled Lisp function in `subr.el
'.
(unmsys--file-name FILE)
Produce the canonical file name for FILE from its MSYS form.
On systems other than MS-Windows, just returns FILE.
On MS-Windows, converts /d/foo/bar form of file names
passed by MSYS Make into d:/foo/bar that Emacs can grok.
This function is called from lisp/Makefile and leim/Makefile.