Don't include module 'year2038-required' in all-of-gnulib testdirs

[Bruno Haible]

While I know that the module 'year2038-required' is being worked on by Paul
[1], it hampers my ability to do portability testing if the testdirs that
contain all of gnulib fail to configure on a third of the possible platforms.
For now, I need to exclude module 'year2038-required' from these testdirs.

[1] https://lists.gnu.org/archive/html/bug-gnulib/2023-04/msg00075.html


2023-04-15  Bruno Haible  <bruno@clisp.org>

        Don't include module 'year2038-required' in all-of-gnulib testdirs.
        * all-modules (exclude): Add year2038-required.

diff --git a/all-modules b/all-modules
index 9e90b02273..5b742245cc 100755
--- a/all-modules
+++ b/all-modules
@@ -89,7 +89,7 @@ exclude_for_mingw="$exclude_for_mingw forkpty-tests forkpty 
login_tty-tests logi
 exclude_for_msvc="$exclude_for_mingw"
 
 # Command-line option processing.
-exclude=
+exclude="year2038-required"
 while test $# -gt 0; do
   case "$1" in
     --for-mingw | --for-ming | --for-min | --for-mi )