They crash the GPU driver of my r200 WinXP laptop, causing anything from
a BSOD to a frozen or black screen and sometimes incorrectly set
resolutions.

wined3d: Only invalidate STATE_INDEXBUFFER for the current context in buffer_create_buffer_object().

wined3d: Rewrite surface_modify_location() on top of surface_validate_location() and surface_invalidate_location().

Otherwise invoking winegcc on any platform where our first guess at
the link options fails results in a lot of confusing error messages.

This stops the tested gcc command from issuing a warning on Solaris.