hashx: Fix compiled hash function on NetBSD
NetBSD includes the idea of a 'maximum protection' per-region, and an mprotect which exceeds the max protection will be denied. If we explicitly ask for a maximum which includes execute permission, we can successfully swap our code buffer's permissions between read-write and read-execute when each hash program is compiled. With this patch, the crypto/hashx tests pass on NetBSD 9. This addresses bug #40844
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