[RFA] cpplib/C/C++: Unify character constant interpretation

[Jason Merrill]

>>>>> "Neil" == Neil Booth <neil@daikokuya.demon.co.uk> writes:

> 5) Stuff like 'abcd' in C++ is truncated to a character 'd' in the
>    C++ front end.  Previously it remained an int.  I doubt anyone cares
>    either, though this is the point I'm least sure about.  Anyone?

I'm pretty sure some BeOS sources rely on multi-character character constants,
perhaps Apple as well.  I'd be very reluctant to break them.

Jason