feature: Add glsl version to wflinfo
Created by: dcbaker
I'm working on a project for fast skipping in piglit for tests that require OpenGL versions and extensions that the driver doesn't support. wflinfo is very nice for this since it provides an easily parsable format for getting the OpenGL version and the extensions list. It's also nice since it is available on Linux, and hopefully soon Windows, making it more standard than glxinfo or other similar tools. The only thing I have run into is shader_runner tests and glsl_parser tests can have glsl requirements, and I cannot get that information from wflinfo