sysctl: Add indirection of symbols to remove clash with sanitizers

Add indirection and symbol renaming under MKSANITIZER for the linked in
version of sysctlbyname and sysctlgetmibinfo.

use the proper variable

RUMP_ACTION -> RUMPPRG

make sysctl(8) work as a rump client

Comment out CFLAGS+=-g.

PPR/29909: Manuel Bouyer: sysctl dumps core if kern.consdev returns unknown
device. If we cannot determine the device name of the console, print the
console dev_t in hex.

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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New sysctl(8) binary. Performs auto-discovery and can add/remove
nodes from the tree. Never needs to be recompiled again.

tweaks for fparseln(3) move from libutil to libc:
- remove #include <util.h> if nothing else needed it
- remove LDFLAGS+=-lutil if nothing else needed it

Use ${NETBSDSRCDIR}/some/path instead of ${.CURDIR}/../../some/path

handle new emulation sysctls, and cleanup function duplication.

Add a "-f file" flag to process directives from a file.

don't install /usr/sbin/sysctl (backward compat symlink)

move sysctl to /sbin/sysctl. symlink from /usr/sbin/sysctl
is supplied for backward compatibility.

add /sbin/sysctl to base/mi (does not remove /usr/sbin/sysctl
as we have a symlink)

Moved from usr.sbin/sysctl/Makefile,v