[fortran,patch] Don't write common more than once in a module file (PR 30285)

[FX Coudert]

> Sorry, that I didn't think of this earlier.  If you haven't  
> committed the patch yet, and since you're touching it, can you  
> please change the code to traverse the common tree in left-to-right  
> order in order to prevent spurious differences between module  
> files?  Note that there's an early return in write_common0, so you  
> have to be a bit careful.

Here's what I've committed (using your recent change to write_symbol0  
as a model for tree traversing) as rev. 130257.

FX


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