Work around a windows specific problem in tests.

On Windows, delete-file-recursively sometimes fails
to delete certain jar files, which results in cascading
test failures.

An explicit call to System/gc seems to solve the problem
on Windows Vista.

test/leiningen/test/deps.clj

@@ -51,6 +51,10 @@
       (let [rel-repo-snaps-dep (assoc pr :dependencies [slamhound])]
         (is (thrown? Exception (with-no-log (deps rel-repo-snaps-dep))))))
     (finally
+     ;; This gc call is a workaround for a windows specific problem
+     ;; where jars fail to get deleted. An explicit call to gc seems
+     ;; to solve the issue.
+     (System/gc)
      (delete-file-recursively (:library-path sample-project) :silently))))
 
 (def native-lib-files-map