cmake CC_HAS_AESNI256 examples

omnigres/omnigres deps/h2o/deps/picotls/cmake/fusion.cmake :9

CHECK_C_SOURCE_COMPILES("
    #include <emmintrin.h>
    #include <immintrin.h>
    int main(void) {
        __m256i  ord0, ord1, ord2, ord3 = _mm256_setzero_si256();
        ord0 = _mm256_aesenc_epi128(ord1, ord2);
        ord3 = _mm256_aesenclast_epi128(ord0, ord1);
        ord1 = _mm256_clmulepi64_epi128(ord3, ord2, 0x00);
        _mm_insert_epi64(_mm_setr_epi32(0, 1, 2, 3), 0, 0);
        return 0;
    }
    " CC_HAS_AESNI256)