Remove mingw based cross build from travis config

 - It can't find the headers on the travis CI machines, but works
   perfectly on the Ubuntu Bionic VM I set up localy. Don't know why
   yet.
 - The mkwinbins.sh script runs the unit tests through wine. I don't want
   to remove that from the script but I also don't want to install all of
   wine on the CI machines for every build.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

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