filter: move to extensions

extensions/Makefile.am

@@ -52,6 +52,7 @@ extension_LTLIBRARIES =		\
   m_adminwall.la		\
   m_echotags.la			\
   m_extendchans.la		\
+  filter.la			\
   m_findforwards.la		\
   m_identify.la			\
   m_locops.la			\

modules/Makefile.am

@@ -29,7 +29,6 @@ auto_load_mod_LTLIBRARIES = \
   m_dline.la \
   m_encap.la \
   m_etrace.la \
-  filter.la \
   m_grant.la \
   m_help.la \
   m_info.la \