[ping] C++ fixes in the controll flow graph (cfg*)

[Zdenek Dvorak]

Hello,

> > yes (modulo the formating of the changelog entry).
> as this would be my first changelog entry, what precisely do I have to
> change? I omitted the header (date+name+email) and did not indent the
> text with a tab, but otherwise I thought it would be ok...

I meant just the indentation;  I am not quite sure about this line,
though; I think each file should be listed separately, but I may be
wrong:

	* graphds.h graphds.c cfgloopanal.c: Updated all usages of edge to
	graph_edge.

Zdenek