Updated: qt5-base 5.15.18-2 (test)

[Mark Geisert]

The following packages have been uploaded to the Cygwin distribution:

* libQt5Core5-5.15.18-2
* libQt5Core-devel-5.15.18-2
* libQt5Sql5-5.15.18-2
* libQt5Sql-devel-5.15.18-2
* libQt5Gui5-5.15.18-2
* libQt5Gui-devel-5.15.18-2
* qt5-base-doc-5.15.18-2
* qt5-base-examples-5.15.18-2

Qt is a cross-platform application framework for desktop and
embedded development. Qt enables programmers to create advanced GUI
applications once and deploy them to Windows, Mac OS X and Linux without
rewriting the source code. Companies using Qt can leverage software
investments made on one platform across many others.

This is a "-2" test release of what is expected to be the last Qt5 version
available from upstream.  Please report any discrepancies from earlier
Cygwin-available Qt5 packages to the main Cygwin mailing list.  If all seems
well, this version will probably be promoted from test in a couple weeks.
Enjoy,

..mark

PS: The only change from -1 is to avoid avx2 cpu instructions due to an
unreported Qt5Gui bug that prevents doxywizard and 'octave --gui' from
launching.