[cairo] [PATCH] Add CPU detection for VC++ x64

[Makoto Kato]

Hi, developers.

x64 CPU has MMX and SSE2 extension.  So, gcc code always return true
for pixman_have_mmx() or pixman_have_sse2().  But the current code
doesn't consider VC++.
Also, since VC++ x64 doesn't support inline assembler, we cannot build
pixman-cpu.c by default makefile.

I am looking forward to merging this patch.

-- 
-- Makoto Kato <m_kato at ga2.so-net.ne.jp>
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