gnulib: update to latest upstream revision.

* gnulib: Update.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
version 2.4.2.418

* NEWS: Record release date.
maint: post-release administrivia

* NEWS: Add header line for next release.
* .prev-version: Record previous version.
* cfg.mk (old_NEWS_hash): Auto-update.
tests: use autotest as_unset rather than rerolling $unset locally.

On at least Unixware 7.1.4, the shell variable 'unset' gets set
to 'no' during the testsuite run, breaking several test cases.
We should have been using Autotest $as_unset anyway.
* tests/testsuite.at (unset): Remove test and variable setting.
(LT_AT_MAKE): Use $as_unset as provided by autotest boilerplate
instead of our own $unset.
* tests/demo.at (uninstalled libraries ave priority): Likewise.
Reported by Tim Rice.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
bootstrap: search for a non-truncating sed binary.

On at least Unixware 7.1.4, the first sed binary on PATH is
unable to process the extract-trace scripts.
* gl/build-aux/funclib.sh (PATH_SEPARATOR): Set to : or ;
according to a feature test.
(func_executable_p): New function.
(SED): Search PATH for a sed binary that doesn't truncate its
own output if available, and set SED accordingly.
(scriptversion): Update.
* Makefile.am (SCRIPT_ENV): New macro, for propagating configured
variables.
(ltdl_ac_aux_dir, $(ltmain_sh), install-data-local): Use it.
* bootstrap: Regenerate.
Reported by Tim Rice.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
bootstrap: search for a non-truncating grep binary.

On at least Unixware 7.1.4, the first grep binary on PATH is
unable to process the extract-trace scripts.
* gl/build-aux/funclib.sh (GRUP): Search PATH for a grep binary
that doesn't truncate its own output if available, and set GREP
accordingly.
* Makefile.am (SCRIPT_ENV): Add setting for GREP.
* bootstrap: Regenerate.
Reported by Tim Rice.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
refactor: simplify program path searching in funclib.sh.

* gl/build-aux/funclib.sh (func_path_progs): New function. Factor
out common code from GREP and SED searches.
(func_check_prog_sed, func_check_prog_grep): New functions, for
non-common code.
(scriptversion): Update.
* bootstrap: Regenerate.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
bootstrap: show found GREP and SED in verbose mode.

* gl/build-aux/bootstrap.in (EGREP, FGREP, GREP, SED): Remove.
These are already set by funclib.sh.
(func_prep): After --verbose has been processed, show the paths
to GREP and SED found by funclib.sh.
* bootstrap: Regenerate.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
funclib.sh: simplify version comparison functions.

* gl/build-aux/funclib.sh (func_sort_ver): Much simplified.
(func_lt_ver): New function, return true if arguments are in
ascending order.
* gl/build-aux/bootstrap.in: Simplify with func_lt_ver.
* gl/build-aux/do-release-commit-and-tag.diff: Likewise.
* bootstrap: Regenerate.

Co-Authored-by: Paul Eggert <eggert@cs.ucla.edu>
Signed-off-by: Gary V. Vaughan <gary@gnu.org>
bootstrap: fix a quoting error.

* gl/build-aux/bootstrap.in (func_require_buildreq_autoconf): Quote
the extracted version number correctly so that it is displayed in
verbose mode.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>