cmdutils: remove this_year constant, use CONFIG_THIS_YEAR instead

Simplify.

cmdutils.c

@@ -69,8 +69,6 @@ struct SwsContext *sws_opts;
 AVDictionary *swr_opts;
 AVDictionary *format_opts, *codec_opts, *resample_opts;
 
-const int this_year = CONFIG_THIS_YEAR;
-
 static FILE *report_file;
 
 void init_opts(void)
@@ -1072,7 +1070,7 @@ static void print_program_info(int flags, int level)
     av_log(NULL, level, "%s version " FFMPEG_VERSION, program_name);
     if (flags & SHOW_COPYRIGHT)
         av_log(NULL, level, " Copyright (c) %d-%d the FFmpeg developers",
-               program_birth_year, this_year);
+               program_birth_year, CONFIG_THIS_YEAR);
     av_log(NULL, level, "\n");
     av_log(NULL, level, "%sbuilt on %s %s with %s\n",
            indent, __DATE__, __TIME__, CC_IDENT);

cmdutils.h

@@ -43,11 +43,6 @@ extern const char program_name[];
  */
 extern const int program_birth_year;
 
-/**
- * this year, defined by the program for show_banner()
- */
-extern const int this_year;
-
 extern AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB];
 extern AVFormatContext *avformat_opts;
 extern struct SwsContext *sws_opts;

ffprobe.c

@@ -2422,7 +2422,7 @@ static void ffprobe_show_program_version(WriterContext *w)
     writer_print_section_header(w, SECTION_ID_PROGRAM_VERSION);
     print_str("version", FFMPEG_VERSION);
     print_fmt("copyright", "Copyright (c) %d-%d the FFmpeg developers",
-              program_birth_year, this_year);
+              program_birth_year, CONFIG_THIS_YEAR);
     print_str("build_date", __DATE__);
     print_str("build_time", __TIME__);
     print_str("compiler_ident", CC_IDENT);