guards for includes ok?

[Poul-Henning Kamp]

--------
In message <555C9496.2090404 at schokola.de>, Nils Goroll writes:

>Does anyone have objections to adding guards (like #ifdef
>VARINSH_CACHE_CACHE_H_INCLUDED) to all our includes? This would make it easier
>for vmod authors because compilers wouldn't barf about double includes.

I had actually thought about doing the opposite:  Add a "don't include
this more than once" guard:

	#ifdef COMBINER_H_INCLUDED
	#  error "combiner.h included multiple times"
	#endif
	#define COMBINER_H_INCLUDED

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