UPDATE: math/octave 2.9.12 -> 2.9.13

[Daniel Dickman]

I've put together an update patch for octave. Seems like some of the
OpenBSD patches have been merged upstream.

This worked fine for me on i386.

Patch can be found here:
http://www.dickman.org/openbsd/ports_math_octave_2.9.13.patch