Merge branch 'vc-plugins' of https://github.com/jef-n/gdal into vc-plugins

From: Even Rouault <even.rouault@mines-paris.org>

git-svn-id: https://svn.osgeo.org/gdal/trunk@25564 f0d54148-0727-0410-94bb-9a71ac55c965