Build with GLCANVAS

[phile314]

WxPack doesn't build GLCANVAS support (wxUSE_GLCANVAS), which makes it impossible to compile the wxHaskell (https://github.com/wxHaskell/wxHaskell) bindings using wxPack. Can GLCANVAS support be enabled?

[rjpcomputing]

We turned it on now in the settings.h and it will build on our servers. But if this does not build correctly we will have to revert the change. This is mainly because we don't have a way to test this and we don't use it. So if you could help if there is issues that would be great.

[phile314]

I can try it with some examples and see if it works. I am actually not going to use the gl support myself, it is just that the wxhaskell library requires gl support, and making this a conditional dependency would be rather complicated. Just let me know when you have a test build, and I will give it a try.