winex11: Use GLXFBConfig for the pixel format list

[Chris Robinson]

This greatly simplifies some of the wgl code by keeping around a single 
customized fbconfig array, instead of holding a static, custom-typedef array 
which left many functions to query glx for the fbconfig list anyway (which in 
turn caused many needless, potentially problematic allocations and 
deallocations of memory).

This doesn't change the behavior of the code, but it makes it simpler for 
future enhancements (such as supporting extra fbconfigs for on-screen or 
off-screen use), and easier maintanence by removing a lot of duplicate code.
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