Move sysctlbyname(), sysctlnametomib(), and sysctlgetmibinfo() from
sysctl(8) into libc, making the minor number jump. Add prototypes to
sys/sysctl.h, fix sets, modify man pages, etc. That oughta c

Move sysctlbyname(), sysctlnametomib(), and sysctlgetmibinfo() from
sysctl(8) into libc, making the minor number jump. Add prototypes to
sys/sysctl.h, fix sets, modify man pages, etc. That oughta cover it.

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Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22308, verified by myself.

Don't declare 'extern opt*' getopt variables.

Moved from usr.sbin/sysctl/pathconf.c,v