avcodec: Change values of codec ids at the end of lists that dont exist outside ffmpeg yet so

they wont conflict when they get added to the fork with randomly changed order and values.
Also add duplicate codec_ids to allow maintaining compatibility.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/avcodec.h

@@ -212,12 +212,14 @@ enum CodecID {
     CODEC_ID_WMV3IMAGE,
     CODEC_ID_VC1IMAGE,
 #if LIBAVCODEC_VERSION_MAJOR == 53
-    CODEC_ID_8SVX_RAW,
-    CODEC_ID_G2M,
+    CODEC_ID_G723_1_DEPRECATED,
+    CODEC_ID_G729_DEPRECATED,
 #endif
     CODEC_ID_UTVIDEO_DEPRECATED,
     CODEC_ID_UTVIDEO = 0x800,
 
+    CODEC_ID_G2M        = MKBETAG( 0 ,'G','2','M'),
+
     /* various PCM "codecs" */
     CODEC_ID_FIRST_AUDIO = 0x10000,     ///< A dummy id pointing at the start of audio codecs
     CODEC_ID_PCM_S16LE= 0x10000,
@@ -350,11 +352,12 @@ enum CodecID {
     CODEC_ID_QDMC,
     CODEC_ID_CELT,
 #if LIBAVCODEC_VERSION_MAJOR > 53
-    CODEC_ID_G723_1,
-    CODEC_ID_G729,
+    CODEC_ID_G723_1_DEPRECATED,
+    CODEC_ID_G729_DEPRECATED,
 #endif
     CODEC_ID_G729 = 0x15800,
     CODEC_ID_G723_1= 0x15801,
+    CODEC_ID_8SVX_RAW   = MKBETAG('8','S','V','X'),
 
     /* subtitle codecs */
     CODEC_ID_FIRST_SUBTITLE = 0x17000,          ///< A dummy ID pointing at the start of subtitle codecs.
@@ -367,14 +370,14 @@ enum CodecID {
     CODEC_ID_HDMV_PGS_SUBTITLE,
     CODEC_ID_DVB_TELETEXT,
     CODEC_ID_SRT,
-    CODEC_ID_MICRODVD,
+    CODEC_ID_MICRODVD   = MKBETAG('m','D','V','D'),
 
     /* other specific kind of codecs (generally used for attachments) */
     CODEC_ID_FIRST_UNKNOWN = 0x18000,           ///< A dummy ID pointing at the start of various fake codecs.
     CODEC_ID_TTF= 0x18000,
-    CODEC_ID_BINTEXT,
-    CODEC_ID_XBIN,
-    CODEC_ID_IDF,
+    CODEC_ID_BINTEXT    = MKBETAG('B','T','X','T'),
+    CODEC_ID_XBIN       = MKBETAG('X','B','I','N'),
+    CODEC_ID_IDF        = MKBETAG( 0 ,'I','D','F'),
 
     CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it