WGL: print more debug info

[Roderick Colenbrander]

Hi,

This patch lets the opengl init code in winex11.drv print out some more debug 
info. The info is very useful for in WINEDEBUG=+wgl logs as we directly know 
which GL drivers are in use and whether those have been set up correctly.

Regards,
Roderick Colenbrander
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