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src/util/u_cpu_detect.c: add PowerPC auxv AltiVec/VSX detection

nina requested to merge q66/mesa:auxv-altivec into master

At least on Linux, we can do this to detect the presence of AltiVec and VSX without having to go through SIGILL handling, which has tons of problems.

A similar thing is already being done for ARM to detect NEON.

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