Fix problem with initial viewport/scissor size.
If an app never called glViewport, the viewport size was always 0 by 0 pixels. Now pass initial size to st_create_framebuffer() and initialize the viewport and scissor bounds in st_make_current(). This could also be fixed by ensuring the gl_framebuffers passed to _mesa_make_current() were initialized to the right size. But that involves allocating the renderbuffers/pipe_surfaces earlier and that runs into some other issues ATM. Also remove obsolete createRenderbuffers param to st_create_framebuffer().
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