Update miniupnpc to 1.9.20151008

This version of miniupnpc fixes a buffer overflow in the XML (ugh)
parser during initial network discovery.

http://talosintel.com/reports/TALOS-2015-0035/

The commit fixing the vulnerability is:
https://github.com/miniupnp/miniupnp/commit/79cca974a4c2ab1199786732a67ff6d898051b78

Reported by timothy on IRC.