[Octave-bug-tracker] [bug #65318] Deprecation warning with C++20

[Markus Mützel]

Follow-up Comment #14, bug#65318 (group octave):

The actual error is this:

../libinterp/corefcn/sysdep.cc: In lambda function:
../libinterp/corefcn/sysdep.cc:910:62: error: 'h_subkey' is not captured
  910 |   unwind_action restore_keys ([] () { reg_close_key_wrapper
(h_subkey); });
      |                                                              ^~~~~~~~
../libinterp/corefcn/sysdep.cc:910:32: note: the lambda has no
capture-default
  910 |   unwind_action restore_keys ([] () { reg_close_key_wrapper
(h_subkey); });
      |                                ^
../libinterp/corefcn/sysdep.cc:901:8: note: 'HKEY__* h_subkey' declared here
  901 |   HKEY h_subkey;
      |        ^~~~~~~~


This and some similar errors should be fixed with this change:
https://hg.savannah.gnu.org/hgweb/octave/rev/5b54c2fb69bb



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