make sure we compile ejabberd_socket

Author: Christopher 'Tofu' Zorn

Emakefile

@@ -1,4 +1,5 @@
 {'src/ejabberd_c2s',           [{outdir, "ebin"},{i,"/usr/lib/ejabberd/include"}]}.
 {'src/ejabberd_receiver',      [{outdir, "ebin"},{i,"/usr/lib/ejabberd/include"}]}.
+{'src/ejabberd_socket',      [{outdir, "ebin"},{i,"/usr/lib/ejabberd/include"}]}.
 {'src/web/ejabberd_http_bind', [{outdir, "ebin"},{i,"/usr/lib/ejabberd/include"},{i,"/usr/lib/ejabberd/include/web"}]}.
 {'src/web/mod_http_bind',      [{outdir, "ebin"},{i,"/usr/lib/ejabberd/include"},{i,"/usr/lib/ejabberd/include/web"}]}.