[distcc] Patch to state.h

[Frerich Raabe]

Moin,

the attached patch makes it possible to build C++ programs which link against 
state.o and use functions declared in state.h by adding an extern "C" 
directive if necessary.

It also adds an include guard to remove the burder from the client including 
state.h of keeping track of possible multiple inclusion problems.

- Frerich

-- 
"If you fail to adjust your notion of fairness to the reality of the Universe, 
you will probably not be happy." - Paratima, of http://free-dc.org fame
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