re: Proposal: change requirement for tools from C89 to C99

[matthew green <mrg%eterna.com.au@localhost>]

> I therefore propose to require C99 instead of C89 as the baseline
> standard for everything in tools/.

i'm OK with this.


.mrg.

(randomly, ircII forced C89 in 2004, with no bug reports that
i recall, and C99 in 2014, and so far i've had one report of
compile failure.  probably using the now deleted GCC too to
unprotoize would work.)