Convert 3.2 sources to ISO C90

[Marc Espie]

I still have some big troubles understanding what's the point in
moving gcc sources to ISO-C ?

It's not as if K&R C was such an arcane dialect.  Are there really that
many gcc developers that don't know K&R C. Heck, I'm much more confused
by the mostly unreadable GNU coding conventions myself.

Plust, it's going to divert some people's energy (Jeff) into making 
HP-UX work still (and loads of bug-reports I am sure).

Could we try to do something useful instead, like regaining some speed
in the compiler ?...