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Binary op pow with scalar compute error on sse2

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commit b4ba207c18d3103d6df890c0e3a97b469b196b26 (tag: 20220729) Author: nihui Date: Thu Jul 28 17:47:27 2022 +0800 more strict compiler rvv checks, drop rvv-071 support (#4094) Tested on x86 cpu with `g++ (GCC) 12.2.0`...