Revert "iso_639_languague_code_t is defined in two descriptors."

Found better solution.

This reverts commit 3b68bd17.

src/descriptors/dr.h

@@ -32,13 +32,6 @@
 #ifndef _DVBPSI_DR_H_
 #define _DVBPSI_DR_H_
 
-/* common definitions */
-#ifndef DVBPSI_ISO639_LANGUAGE_CODE_T
-#define DVBPSI_ISO639_LANGUAGE_CODE_T 1
-typedef uint8_t iso_639_language_code_t[3]; /*!< ISO639 three letter language codes */
-#endif
-
-/* Descriptors */
 #include "dr_02.h"
 #include "dr_03.h"
 #include "dr_04.h"

src/descriptors/dr_0a.h

@@ -40,11 +40,7 @@ extern "C" {
 #endif
 
 #define DR_0A_API_VER 2                     /*!< descriptor 0a API version */
-
-#ifndef DVBPSI_ISO639_LANGUAGE_CODE_T
-#define DVBPSI_ISO639_LANGUAGE_CODE_T 1
 typedef uint8_t iso_639_language_code_t[3]; /*!< ISO639 three letter language codes */
-#endif
 
 /*****************************************************************************
  * dvbpsi_iso639_dr_t

src/descriptors/dr_49.h

@@ -38,10 +38,7 @@
 extern "C" {
 #endif
 
-#ifndef DVBPSI_ISO639_LANGUAGE_CODE_T
-#define DVBPSI_ISO639_LANGUAGE_CODE_T 1
 typedef uint8_t iso_639_language_code_t[3]; /*!< ISO639 three letter language codes */
-#endif
 
 /*****************************************************************************
  * dvbpsi_country_availability_dr_t