Fixes a failure in ddraw p8_primary_test when running with opengl ddraw renderer.

Needed to prevent ActivateContext being called while holding gl lock.

Don't apply relocations to non page-aligned binaries.

The DirectDraw cube mapping interface has a few pitfalls. So far we have
a test testing the surface enumeration, this adds a rendering test. So
far everything used in the test works.

This is needed on both windows and wine, seems to be a hardware thing.