dfa.c no longer usable if no 64-bit support

[arnold]

Hi.

The gentleman who maintains the gawk port for VMS reports that he
can get dfa.c to compile on Vax/VMS, but that he gets failues when
trying to use it to compile regular expressions.

The Vax/VMS C compiler does not support 64 bit integers at all
(unlike GCC on 32-bit x86, for example).

This may not be a blocker, but even if not, disabling use of dfa.c for
regular expression matching means that gawk will run slower on that
system.

Can dfa.c be made 32-bit compatibile in a happy fashion?

Thanks,

Arnold