fix build error and add easy to use overview script

[pauldreik]

Following the request on https://rigtorp.se/isatomic/ I test ran this on two systems with avx512:

128   OK
128u  OK
128s  FAILED
256   OK
256u  OK
256s  FAILED
512   OK
512s  FAILED
==============================
cpu:  Intel(R) Xeon(R) Gold 6338 CPU @ 2.00GHz
avx flags:
avx
avx2
avx512_bitalg
avx512bw
avx512cd
avx512dq
avx512f
avx512ifma
avx512vbmi
avx512_vbmi2
avx512vl
avx512_vnni
avx512_vpopcntdq

128   OK
128u  FAILED
128s  FAILED
256   OK
256u  FAILED
256s  FAILED
512   FAILED
512s  FAILED
==============================
cpu:  AMD Ryzen 9 7950X3D 16-Core Processor
avx flags:
avx
avx2
avx512_bf16
avx512_bitalg
avx512bw
avx512cd
avx512dq
avx512f
avx512ifma
avx512vbmi
avx512_vbmi2
avx512vl
avx512_vnni
avx512_vpopcntdq