GCC 5.1.0 in mxe-octave

[John W. Eaton]

I updated mxe-octave and noticed that GCC has been updated to 5.1.0.  Is 
this necessary for some bug fixes?  If not, I'd prefer to stay at the 
previous version for the Octave 4.0.x releases.

More generally, how should we manage Octave releases and mxe-octave 
development?  I'd guess that whatever Octave 4.0.x releases that we make 
should be done with the same set of tools.  Also possibly with the same 
set of packages, with only bug fixes applied, same as we do for the 
Octave releases themselves.  But I don't know that we have a good way of 
handling that as package development proceeds separately from Octave 
development.

jwe