Convert 3.2 sources to ISO C90

[Daniel Berlin]

> 
>  > Again, a minor issue, and I wouldn't even have brought it up if
>  > I didn't think that the time and complexity savings justified the
>  > small effort of making the transition.
> I disagree strongly.  It wasn't that long ago I was on-site with a customer
> that had applied a patch from HP which resulted in their copy of GCC being
> utterly useless.  In fact, the HP patch made any existing GCC binary from
> anywhere utterly useless.   This particular customer didn't have the
> unbundled compiler from HP.  Luckily I was able to identify the problems
> the HP patch caused, fix the source for GCC, then bootstrap it using HP's
> bundled compiler.  If we had ANSI-ified the sources, then we would have been
> hosed worse than I care to imagine.

Yes, so hosed you'd have to run ansi2knr (included by automake, and in 
fact, if we used automakeified makefiles, it could be run automatically 
for us when necessary) over the files.

BFD.
--Dan