maint: use modules/tempname.diff file, not a replacement; update gnulib

Using a .diff is much more maintainable.  Otherwise, changes in
the gnulib module description file may not be noticed and merged
promptly and may even result in subtle errors.  Luckily, this time,
the failure to propagate gnulib's changes to modules/tempname resulted
only in an obvious link failure.
* gl/modules/tempname: Remove file.
* gl/modules/tempname.diff: Use a .diff file instead.
* gnulib: Update submodule to latest.

1 files changed, 0 insertions, 0 deletions

diff --git a/gnulib b/gnulib
-Subproject a203d01a877e80e8a07147d892ec89a63498f7f
+Subproject 6eedb6a104486c2df4384195e5dfc487d97c5be