[gdal-dev] C++11: virtual and override

[Kurt Schwehr]

About to start dropping virtual when there is override and convert
CPL_OVERRIDE to override

I tested the override on destructors that got me in trouble with MSVC older
compilers not to long ago and all CI runs pass.
https://trac.osgeo.org/gdal/changeset/41034

Example diff for the change in frmts/raw:

https://pastebin.com/uuMv6mWj

>From https://trac.osgeo.org/gdal/wiki/rfc68_cplusplus11:

    7. CPL_OVERRIDE -> override and remove redundant virtual

-kurt
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