[cairo] [PATCH] Add support for SSE2 fast path

[Rodrigo Kumpera]

Hey,

The attached patch add support for sse2 enabled functions on ia-32. It
follows Soeren's advice[1] on how to do it.
It adds a new USE_SSE2 define that is properly detected at configure time.
I'm using SSE2 since there
isn't much stuff that can be archived with just SSE1.

Sorry for any kludge on the autotools parts as I'm not very familiar with
them.

This patch is preparatory work for André Tupinambá's patch[2] with SSE2 fast
paths.

Thanks,
Rodrigo Kumpera


[1]http://lists.cairographics.org/archives/cairo/2008-March/013340.html
[2]http://lists.cairographics.org/archives/cairo/2008-March/013332.html
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