[patch] clarifications for comments in cpp

[Neil Booth]

Martin Schaffner wrote:-

> He, I thought "eternal" was supposed to mean "used all the time"... :-)
> 
> Martin Schaffner
> 
> 2003-06-24 Martin Schaffner <schaffner at gmx.li>
> 
> 	* cppfiles.c: Clarify comments.
> 	* cpphash.h: Likewise.
> 	* cpplib.h: Likewise.
> 	* cppmacro.c: Likewise.
> 	* mkdeps.h: Likewise.

I've applied this, but replaced "of CPP" with something more
appropriate.

Neil.