[openbeos] -Wmissing-prototypes

Hello all,

I've been helping Rudolf with his graphics drivers and we are running into a 
_lot_ of these 
warnings:

warning: no previous prototype for `xxx'

Now, we can fix these by taking every function like this:

int function(void) {
}

And adding this line in front:

extern int function(void);

But this seems really stupid.  Does anyone have a strong argument for 
preserving this warning?  
Perhaps there is an alternative warning we could use instead?  Or perhaps we 
could at least 
remove it from CCFLAGS and keep it for C++FLAGS?

Andrew

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