Update submodules: plugins (new commits)

plugins:
    2fa1a4b Chris Smith <chris@dmdirc.com>
            Fix various dependencies.

            Gerrit: http://gerrit.dmdirc.com/2703

Change-Id: If3c86b50d1fceca653d59266c20149e345c76d11

modules/plugins

@@ -1 +1 @@
-Subproject commit 5fdc06f334cb222f6f41b301ff2e3317d44c368f
+Subproject commit 2fa1a4b70bb0a8f9e2a9f699b6660ffce6e6a9a1