fix hint and gl2 build. NOTE: this does not change that GL2 segfaults right away. that is an issue that dates back at least 50 commits, but most likely even back to the webgl merge. I guess nobody actually tried to run hedgewars in GL2 since back then :P

AAAAw3icJc6xDcIwEAXQz+niWBhkiggxAS0djZs0kYVASFmBBWiYw0xAQ5sOV7SZgBpKRvAC+Ezz9PWlfzrd8BHmyzvwiTvoFe7QTf0AAoaIUO9hrwUMpQN56iN5tcT8U6C+dKADuzi7scsHeJuEnCaXJOSkXklAtWaXBBjDbRJKF/7dgtsgyPYcBNm+gwBtaTNqqzyqJ3fj1Oeff4W8JYk=