sgtpuzzles: add a .upstream file for autoupdating

Changed files
+5
pkgs
games
sgt-puzzles
+5
pkgs/games/sgt-puzzles/default.upstream
···
+
minimize_overwrite
+
url http://www.chiark.greenend.org.uk/~sgtatham/puzzles/puzzles.tar.gz
+
redirect
+
NEED_TO_CHOOSE_URL=
+
version '.*[-_.]([0-9]{8}[.][^.]+)[.]tar[.].*' '\1'