A couple errors in the v2 patchset motivated me to factor the changes
to sys/socket.h and arch/generic/ioctl.h out of the main switchover
commit, so that the latter only touches arch dirs, and acts uniformly
on them. The final result with all patches applied is almost the same,
except now the powerpc and mips[n32] socket.h bits omit the time64
socket options, letting the top-level header's defaults take effect.

All archs I have toolchains handy for, which includes the oddballs
(mips, powerpc) and a few 64-bit ones, have been tested to build
successfully and get the right values of the sockopt and ioctl macros,
utilizing a horrible hack (uncommitted of course) dropped into the
source tree while building.

Hopefully this is "final" now and ready for push.

Rich