[windows] Fix error in recent commit 917a8763 that broke the build.
[windows] Fix error in recent commit 917a8763 that broke the build.

POV-Ray/povray,LeForgeron/povray,LeForgeron/povray,wfpokorny/povray,wfpokorny/povray,c-lipka/povray,wfpokorny/povray,wfpokorny/povray,POV-Ray/povray,wfpokorny/povray,LeForgeron/povray,wfpokorny/povray,LeForgeron/povray,c-lipka/povray,LeForgeron/povray,c-lipka/povray,LeForgeron/povray,POV-Ray/povray,wfpokorny/povray,POV-Ray/povray,POV-Ray/povray,LeForgeron/povray,POV-Ray/povray,c-lipka/povray,POV-Ray/povray,LeForgeron/povray