Remove the hints for Kubota Pacific's Titan 3000 Series Machines.

These appear to be a hold-over from Perl 4 days. We think it unlikely that
perl 5.000 ever compiled correctly on these machines, and changes in 5.004
would definitely have made Perl unbuildable. Given that we've had no bug
reports in 16 years, it's clear that this platform is completely unused,
and thus safe to remove it without any warning period.

See RT #119745 for more details.
Stop using VOIDUSED in the headers.

VOIDUSED was provided by metaconfig to work around pre-ANSI compilers that
didn't support all uses of the void type. We've been mandating a proper ANSI
C89 compiler for at least a decade, so we don't need this any more.
Eliminate the only use of VOIDFLAGS, as part of STMT_START in perl.h

STMT_START has used VOIDFLAGS as part of its conditional compilation since it
was added by commit 728e280303ae3d3b (March 1996). The code originally read:

   /* Now which other defined()s do we need here ??? */

Since then it has been amended to avoid entering that definition for GCC
on Solaris. Given that all current Solaris compilers are C89 conformant,
VOIDFLAGS will always be true (actually 15), so the test is redundant.
Even back in 1996, it's possible that VOIDFLAGS was always non-zero on
SunOS, rendering the test obsolete from the start.

Spotted by Brian Fraser, and extracted from a larger patch of his.
Eliminate the use of voidflags from Configure's pointer size determination.

This should permit metaconfig to drop the entire voidflags logic from
Configure and the config.sh related files.
Merge changes which eliminate VOIDFLAGS and VOIDUSED from active code.

The remaining uses are in Configure and its related generated files, along
with canned config.sh files and configure.com. The next regeneration of
Configure from metaconfg should eliminate nearly all of these, at which point
the remainder can be removed by hand.