Prerelease GNU Make 4.4.0.91

* NEWS: Update the date.
* configure.ac: Change the release.
diff --git a/NEWS b/NEWS
index 54f71e9..36e5776 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,6 @@
 GNU Make NEWS                                               -*-indented-text-*-
   History of user-visible changes.
-  14 January 2023
+  19 February 2023
 
 See the end of this file for copyrights and conditions.
 
@@ -10,7 +10,7 @@
 reporting bugs.
 
 
-Version 4.4.0.90 (14 Jan 2023)
+Version 4.4.0.91 (19 Feb 2023)
 
 This release is primarily a bug-fix release.
 A complete list of bugs fixed in this version is available here:
@@ -44,6 +44,10 @@
 * Updates to allow building on OS/2
   Provided by KO Myung-Hun <komh78@gmail.com>
 
+* Disable FIFO jobserver on GNU/Hurd and Cygwin
+  Experimentation shows that the new FIFO-based jobserver doesn't work well on
+  GNU/Hurd or Cygwin: revert these systems to use the pipe-based jobserver.
+
 
 Version 4.4 (31 Oct 2022)
 
diff --git a/configure.ac b/configure.ac
index 8326c01..2f1168e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -16,7 +16,7 @@
 # You should have received a copy of the GNU General Public License along with
 # this program.  If not, see <https://www.gnu.org/licenses/>.
 
-AC_INIT([GNU Make],[4.4.0.90],[bug-make@gnu.org])
+AC_INIT([GNU Make],[4.4.0.91],[bug-make@gnu.org])
 
 AC_PREREQ([2.69])