* path.h (get_nt_native_path): Add third parameter to declaration and

declare with regparms.
	* path.cc (get_nt_native_path): Add third parameter to allow conversion
	of leading and trailing dots and spaces on filesystems only supporting
	filenames following DOS rules.
	(path_conv::get_nt_native_path): Call get_nt_native_path according to
	fs.has_dos_filenames_only flag.
	(getfileattr): Accommodate new parameter to get_nt_native_path.
	(symlink_info::check): Revamp fs_update_called handling to call
	fs.update only once per call.  Call get_nt_native_path according to
	fs.has_dos_filenames_only flag.  Streamline filesystem dependent code
	not to be called more than once unnecessarily.  Drop code tweaking
	incoming path for broken filesystems only allowing DOS pathnames.
	Rely on changed get_nt_native_path instead.
	* mount.cc (fillout_mntent): Accommodate new parameter to
	get_nt_native_path.
	* strfuncs.cc (tfx_rev_chars): New conversion table with comment.
	(sys_cp_wcstombs): Use tfx_rev_chars rather than tfx_chars.

winsup/cygwin/mount.cc

@@ -1470,7 +1470,7 @@ fillout_mntent (const char *native_path, const char *posix_path, unsigned flags)
   tmp_pathbuf tp;
   UNICODE_STRING unat;
   tp.u_get (&unat);
-  get_nt_native_path (native_path, unat);
+  get_nt_native_path (native_path, unat, false);
   if (append_bs)
     RtlAppendUnicodeToString (&unat, L"\\");
   mntinfo.update (&unat, NULL);