Bug#805799: kst: Fails to build with GSL 2

[peter green]

tags 805799 +patch
thanks

Ubuntu have a fix for this.
https://patches.ubuntu.com/k/kst/kst_2.0.3-4ubuntu3.patch

I cleaned up the changelog and removed ubuntus maintainer changes and 
uploaded to raspbian. Debdiff of that at.

http://debdiffs.raspbian.org/main/k/kst/kst_2.0.3-4%2brpi1.debdiff