Consider making IA-32 build instead of SSE(1), and also making SSE2 build.

[K4sum1]

In my browser testing with New Moon, I found IA-32 and SSE(1) are the same in performance, and only SSE2 shows a noticeable performance increase. So I figure if IA-32 is doable, then it's worth a try to replace the SSE(1) build. Then there should also be a SSE2 build since it gives better performance.

If you want to see the results of my testing, they're here. https://board.eclipse.cx/viewtopic.php?t=669 I would also be willing to test Mypal if I got these versions too.