Merge tag 'v3.7.5'

Three new commits:

commit 8358090292
Author: Paul Eggert <eggert@cs.ucla.edu>
Date:   Wed Jan 20 18:30:16 2021 -0800

    c: port to HP-UX 11.23

commit 2c294c1325
Author: Vincent Imbimbo <vmi6@cornell.edu>
Date:   Sat Jan 23 13:25:18 2021 -0500

    cex: fix state-item pruning

commit c22902e360
Author: Akim Demaille <akim.demaille@gmail.com>
Date:   Sat Jan 23 18:40:15 2021 +0100

    tables: fix handling for useless tokens

NEWS

@@ -1,6 +1,27 @@
 GNU Bison NEWS
 
-* Noteworthy changes in release ?.? (????-??-??) [?]
+* Noteworthy changes in release 3.7.5 (2021-01-24) [stable]
+
+** Bug fixes
+
+*** Counterexample Generation
+
+  In some cases counterexample generation could crash.  This is fixed.
+
+*** Fix Table Generation
+
+  In some very rare conditions, when there are many useless tokens, it was
+  possible to generate incorrect parsers.
+
+*** GLR parsers now support %merge together with api.value.type=union.
+
+*** C++ parsers use noexcept in more places.
+
+*** Generated parsers avoid some warnings about signedness issues.
+
+*** C-language parsers now avoid warnings from pedantic clang.
+
+*** C-language parsers now work around quirks of HP-UX 11.23 (2003).
 
 ** Changes