package/ci: disable building of OVR example on MinGW.
package/ci: disable building of OVR example on MinGW.

Not officially supported, so I don't care.

Squareys/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,Squareys/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,Squareys/magnum-examples,mosra/magnum-examples,Squareys/magnum-examples