tools: Point video-rice url to Narann's fork.
video-rice: Update to commit 262858d.

https://github.com/Narann/mupen64plus-video-rice/commit/262858d

* 262858d fix  Seg fault when glGetString() retrun NULL #32
* 55a9b1e decrease code size removing duplicate code path in ConvertRGBA32()
* 59be54a decrease code size removing duplicate code path