wgl: Match opengl32.dll export ordinals.
/cc @charmainel @bhenden @sroland @kusma
Some apps import GL/WGL symbols by ordinal. See https://github.com/apitrace/apitrace/issues/652
This is not an issue when Mesa is used as an OpenGL ICD, but it might
create troubles when used as a drop-in opengl32.dll
replacement.