[HOpenGL] Choice between old and new API

[Mike Thomas]

Hi Sven, Yann

Svenn wrote to Yann:

> Building under Windoze should pose no real problems nowadays, but Mike is
> doing some nightly builds, perhaps he can even provide you with a binary
> snapshot.

I'll include --enable-hopengl in my builds.  Note that I'm producing MinGW32
rather than Cygwin GHC executables.

There was some trouble with HEAD over the past few days but hopefully that
has already been ironed out.

I'll need somewhere to upload the resulting archive as I don't have a
suitable distribution site.

Cheers

Mike Thomas.