* cygcheck.cc (dirname): New static function.

	* cygcheck.cc (dirname): New static function.
	(find_app_on_path): Use SYMLINK_MAX.  Resolve symlink relative
	to link's location.  Adjust to the fact that cygpath already
	normalizes its return value.
	* path.cc (rel_vconcat): Add cwd parameter, and use it instead
	of calling GetCurrentDirectory() if possible.  Rename throughout.
	(vcygpath): Rename from cygpath and accept cwd and va_list.  Pass
	cwd on to rel_vconcat().
	(cygpath_rel): New front end for vcygpath.
	(cygpath): Ditto.
	* path.h (cygpath_rel): Declare.
	(SYMLINK_MAX): Define to 4095.