fix warnings in cppexp.c

[Neil Booth]

Andreas Jaeger wrote:-

> 
> With current CVS I got on x86-64:
> 
> /usr/src/aj/regression/sources/gcc/gcc/gcc/cppexp.c:247: warning: field precision is not type int (arg 4)
> /usr/src/aj/regression/sources/gcc/gcc/gcc/cppexp.c:257: warning: field precision is not type int (arg 4)
> /usr/src/aj/regression/sources/gcc/gcc/gcc/cppexp.c:268: warning: field precision is not type int (arg 4)
> /usr/src/aj/regression/sources/gcc/gcc/gcc/cppexp.c:278: warning: field precision is not type int (arg 4)
> 
> Ok to commit?  Bootstrapped/regtested on i686-linux-gnu,

Yes, thanks.

Neil.