New sout module langfromtelx, gets lang from telx

This is used in a very particular situation
(language code changing continuously on a single PID, signaled by a
change in teletext data), but maybe other uses can be inspired from it.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

NEWS

@@ -80,7 +80,8 @@ Stream output:
     dst=public_html/iphonestreamfile-###.ts}"
  * RTP: support for Vorbis and Theora
  * Major rework of VoD support
- * New delay module
+ * New delay module, to introduce delays
+ * New setlang, setid and langfromtelx modules
 
 Services Discovery:
  * Search API to be able to query distant search APIs from the interfaces

modules/stream_out/Modules.am

@@ -16,6 +16,7 @@ SOURCES_stream_out_record = record.c
 SOURCES_stream_out_raop = raop.c
 SOURCES_stream_out_smem = smem.c
 SOURCES_stream_out_setid = setid.c
+SOURCES_stream_out_langfromtelx = langfromtelx.c
 
 libvlc_LTLIBRARIES += \
 	libstream_out_dummy_plugin.la \
@@ -32,6 +33,7 @@ libvlc_LTLIBRARIES += \
 	libstream_out_record_plugin.la \
 	libstream_out_smem_plugin.la \
 	libstream_out_setid_plugin.la \
+	libstream_out_langfromtelx_plugin.la \
 	$(NULL)
 
 # RTP plugin