codec: remove makefile recursion

configure.ac

@@ -4219,7 +4219,6 @@ AC_CONFIG_FILES([
   modules/audio_filter/Makefile
   modules/audio_mixer/Makefile
   modules/audio_output/Makefile
-  modules/codec/Makefile
   modules/control/Makefile
   modules/demux/Makefile
   modules/gui/Makefile

modules/Makefile.am

 noinst_LTLIBRARIES =
+noinst_HEADERS =
 BASE_SUBDIRS = \
 	access/rtp \
 	audio_filter \
 	audio_mixer \
 	audio_output \
-	codec \
 	control \
 	demux \
 	gui \
@@ -57,6 +57,7 @@ endif
 
 include common.am
 include access/Makefile.am
+include codec/Makefile.am
 
 if HAVE_WIN32
 module.rc: $(top_builddir)/modules/module.rc.in $(top_builddir)/config.status

modules/demux/Modules.am

@@ -63,7 +63,7 @@ demux_LTLIBRARIES += libavformat_plugin.la
 endif
 
 libes_plugin_la_SOURCES  = mpeg/es.c
-libes_plugin_la_LIBADD = ../codec/libvlc_dts_header.la
+libes_plugin_la_LIBADD = ../libvlc_dts_header.la
 if HAVE_WIN32
 libes_plugin_la_DEPENDENCIES = libes_plugin.rc.o
 endif