Their Windows driver was failing due to too many varyings being used
between the vertex and the geometry stages.

Change-Id: Iec69a2ef29e6ed4ba5ce6e46c7a5eb7db5098d1b
Reviewed-on: https://gerrit.libreoffice.org/22469Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>