Fix patch to virtualbox-ose-additions OpenGL ssupport to actually
work at runtime as much as possible.

The OpenGL bits in VirtualBox 5 are an old implementation that does
not play too well with what wee have in the tree now. Thesse patches
simply change the funzionn prototypess in VirtualBox to match the
ones from mesa so it caan compile and interface as much as possible
with it.

Thanks to Ronald Klop <ronald-lists@klop.ws> for testing.

PR: 250315
Submitted by: rozhuk.im@gmail.com
Approved by: portmgr (fixit blanket)