Okay, I'll implement freeing of error_mgs.

But as I see, we should implement it in two ways:
* sometime we should free th memory (when we want to show a filename in log-file)
* sometime we should use constant buffers. Ex. when we have not enough memory for allocate new buffers - in this case we may have not enough memory for create an error message.

So, would be nice if cgi_error will have addition parameter 'int freeingReason' for example. In this case we may exit from the app immediately when we should use constant buffers (and without freeing error message), and we may exit from the app with freeing error message in other cases.

What do you think about it?