[PATCH] Build libgcc_s on Windows

[Aaron W. LaFramboise]

Paolo Bonzini wrote:

> +  if (pe_dll) {
> +    # This matches SHLIB_SONAME in config/i386/t-cygming.
> +    print "LIBRARY " pe_dll;
> +    print "EXPORTS";
> +  }
> 
> so that in the future it will suffice to have Windows maintainer 
> approval if you change the soname.

I actually tried this, but this doesn't work, because at the time mkmap 
is run, the base soname has not yet been substituted, so you end up with 
@something@_1.dll or something.  Maybe I'll think of a more creative way 
to do this so its not duplicated.