Fix Eclipse project generation

When generating the Eclipse project, the reference to the
several libraries was not added.

Change-Id: Id26017634fed15e7205dd3664806e141d0af0087

BUCK

diff --git a/BUCK b/BUCK
index 11c5585..28e335b 100644
--- a/BUCK
+++ b/BUCK
@@ -32,6 +32,9 @@
 # this is required for bucklets/tools/eclipse/project.py to work
 java_library(
   name = 'classpath',
-  deps = [':importer__plugin'],
+  deps = GERRIT_GWT_API + GERRIT_PLUGIN_API + [
+    ':importer__plugin',
+    '//lib/gwt:user',
+  ],
 )