[pygccxml-development] Patch to let gccxml work

[Allen B. <al...@vr...>]

I have had a patch sitting around in my pygccxml code for a while to 
actually allow gccxml to work on my code base.

You see, some of the code I use and wrap causes gccxml to output warning 
messages during execution.  The current pygccxml code makes the 
assumption that if there is any output then there was error compiling 
the code.  This prevents it from working for me.

I have attached a patch that fixed the problem for me by judging 
successful completion by wether or not gccxml actually generates an 
output file.  This may not be the best way to do this, but it works for me.

-Allen