Upstream version 7.2.0~beta1

Changes:
- Update copyright years for existing copyright holders
- Update license for Bison files
- Drop license & copyright for pygdioctx, removed upstream

This reverts commit 2ff74a3e4e4968693a4cef3ad1002107c3d4a811.

Fails to build with PHP 7.2, see:

 https://github.com/mapserver/mapserver/issues/5592

Upstream version 7.2.0~beta2

This reverts commit a4e9ff2f.

Upstream version 7.2.0