crypt32: Don't decrease the size of the buffer, since we're already counting the characters that we're adding to it.

It doesn't add much.

Although sharing FBOs across contexts is allowed by EXT_framebuffer_object
(issue 76), it causes issues with nVidia drivers. Considering the GL 3 spec
explicitly disallows sharing of FBOs accross contexts (Appendix D), this
patch is probably the right thing to do.

This is just for clarity, so that render targets and the depth stencil are
handled in the same place.

It has to update the whole surface, so NULL must be passed to 
x11_copy_to_screen. Fixes a regression in Red Alert.

It indicates support of colorkey transparency on textures, so set it because 
wined3d supports it. Fixes transparency problems in Forsaken.

There's no need to do that with the nvts and opengl ffp fixed function
fragment pipeline, it's perfectly well defined in GL which one takes
effect. This removes a few more troubles when switching between
shaders and arbfp.

ARB and GLSL don't need that. If a shader backend like atifs or nvts
need it in the future, the shader backend should deal with that rather
than the ffp pipeline.

Half Life 2 uses D3DFMT_X8R8G8B8 for the back buffer, but macos
supports aux buffers only on D3DFMT_A8R8G8B8. I think having aux
buffers is more important right now than having a precise alpha
match.