Remove some unused code.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@195279 65c4cc65-6c06-0410-ace0-fbb531ad65f3

cdr/cdr_custom.c

@@ -49,7 +49,6 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 
 #define CUSTOM_LOG_DIR "/cdr_custom"
 #define CONFIG         "cdr_custom.conf"
-#define DATE_FORMAT    "%Y-%m-%d %T"
 
 AST_THREADSTORAGE(custom_buf);