Use a brute force approach to test for Dual source blend support. Sorry for a direct commit to the main branch but i need fast feedback, and i don't want to leave problematic code in the main branch for a long time. if this approach does not work for the drivers with problems will transform dual source blend to an option in the D3D9 backend. I appreciate the help of the people that tested my last commit and thanks to neobrain for pointing this solution.