openssl: Add <sys/random.h> include for getrandom()

GCC 14 (but not earlier versions) warns about a missing prototype
for getrandom(). Include <sys/random.h> explicitly to bring in the
prototype ra

openssl: Add <sys/random.h> include for getrandom()

GCC 14 (but not earlier versions) warns about a missing prototype
for getrandom(). Include <sys/random.h> explicitly to bring in the
prototype rather than depending on a nested include. While here,
stop defining sysctl_random() since it is no longer used.

Reviewed by: brooks
Fixes: 838b6caababb openssl: use getrandom(2) instead of probing for getentropy(2)
Differential Revision: https://reviews.freebsd.org/D45995

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openssl: use getrandom(2) instead of probing for getentropy(2)

The probing for getentropy(2) relies on re-declaring getentropy(2)
as weak and checking the address, but this is incompatible with
the

openssl: use getrandom(2) instead of probing for getentropy(2)

The probing for getentropy(2) relies on re-declaring getentropy(2)
as weak and checking the address, but this is incompatible with
the _FORTIFY_SOURCE symbol renaming scheme. It's always present on
all supported FreeBSD versions now so we could cut it down to
unconditional use, but there's another segment for getrandom(2)
already that's cleaner to just add us to.

We should upstream this.

Reviewed by: kib (earlier version), markj
Sponsored by: Klara, Inc.
Sponsored by: Stormshield
Differential Revision: https://reviews.freebsd.org/D45976

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