net/syncthing-cli: fix fetch

The archive of text.go that I had was regenerated due to a mistake on my part,
this fixes it.

PR:		194059
Reported by:	marino
- Update to 2014.09.29.2 [1][2]

PR:		193562 [1], 193713 [2] (based on)
Submitted by:	<neel@neelc.org> [1], <never@nevermind.kiev.ua> [2]
Approved by:	araujo (maintainer timeout, 3 weeks)
- Update to 3.1.1
- Fix build with cython-0.21
Be more specific about the linux_base-c6 conversion.

Reviewed by:	xmj
Replace USE_AUTOTOOLS=autoconf213:env with a regular build dependency.
These are the last ports that use this ancient version of autoconf.
Who can forget the famous "i385" architecture?

Submitted by:	xmj