[Pixman] [Patch 1/1] Clang compile failure due to use of __builtin_shuffle

[StormByte]

While playing with Clang and compiling a Gentoo system with it, I
realized that pixman is not compiling because of the use
of /__builtin_shuffle which according to LLVM mailing list, should not
be used directly [1]./

//
/As such, I investigated a bit, and made a patch for making it compile
compatible with Clang that I attach here in the hope that it is reviewed./
//
/Thanks,/
//
/David C. Manuelda/
//
/[1]: //http://lists.llvm.org/pipermail/cfe-dev/2017-August/055142.html
<http://lists.llvm.org/pipermail/cfe-dev/2017-August/055142.html>/
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