PR/45989: Martin Husemann: lint invocation does include -w only on i386

- turn lint -w for all the platforms after fixing the lint warnings.
- add _DIAGASSERTS() for casts that would assign values t

PR/45989: Martin Husemann: lint invocation does include -w only on i386

- turn lint -w for all the platforms after fixing the lint warnings.
- add _DIAGASSERTS() for casts that would assign values to types that
would not fit.
- change types, add casts
- change into ansii prototypes
- turn on _DIAGNOSTIC for libc (during current, to be eliminated for release
builds)

approved by core@

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Don't __weak_alias non-existent symbols. Apparently the alpha
compiler doesn't like it.

last of the RUMP_ACTION syscall swappers

Convert to new 2 clause license

Add missing __RCSID()

Weak aliases for sysctlfoobar() functions.

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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