Add the args4j jar

This allows the tests to all be built and run by bazel.

Bug: 525412
Change-Id: Ie9281d07462cd07200fadb4b0e7b7f88c44f7865
Signed-off-by: Pepper Lebeck-Jobe <eljobe@gmail.com>
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit.pgm.test/BUILD

@@ -13,6 +13,7 @@ junit_tests(
     tags = ["pgm"],
     deps = [
         ":helpers",
+        "//lib:args4j",
         "//lib:commons-compress",
         "//lib:javaewah",
         "//lib:junit",