Update jgit-describe.jar: "Allow subdir to support multiple filtered files using : as a separator."

Change-Id: I35814a36dcada7aa48602dbc8e0835b181ceb2ca
Reviewed-on: http://gerrit.dmdirc.com/2356
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager