PDF: fix potential concurrency problem

git-svn-id: https://svn.osgeo.org/gdal/trunk@25563 f0d54148-0727-0410-94bb-9a71ac55c965
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
Modify test condition for MSSQLSPATIAL_USE_GEOMETRY_COLUMNS (#4967)

git-svn-id: https://svn.osgeo.org/gdal/trunk@25565 f0d54148-0727-0410-94bb-9a71ac55c965
Fix Windows build when plugin list is empty

git-svn-id: https://svn.osgeo.org/gdal/trunk@25566 f0d54148-0727-0410-94bb-9a71ac55c965
Avoid clang warning

git-svn-id: https://svn.osgeo.org/gdal/trunk@25567 f0d54148-0727-0410-94bb-9a71ac55c965
Test VRTRawRasterBand::GetFileList()

git-svn-id: https://svn.osgeo.org/gdal/trunk@25568 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into nas-oci