Update jgit-describe.jar: "Remove stray sysout."

Change-Id: I229e337da9cce4a8af58dfbeecc9a0e09d2fac3a
Reviewed-on: http://gerrit.dmdirc.com/2348
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager