MDEV-30810 errmsg-utf8.txt no longer uses charsets

Charset names in the 'languages' line are not used any more.

Removing to avoid confusion.

All messages in errmsg-utf8.txt are in utf8 now.

Charset names should have been removed in MySQL-5.5 during: https://dev.mysql.com/worklog/task/?id=751

Bump version number.

extra/comp_err.c

@@ -37,7 +37,7 @@
 #define ERRORS_PER_RANGE 1000
 #define MAX_SECTIONS 4
 #define HEADER_LENGTH 32                /* Length of header in errmsg.sys */
-#define ERRMSG_VERSION 4                /* Version number of errmsg.sys */
+#define ERRMSG_VERSION 5                /* Version number of errmsg.sys */
 #define DEFAULT_CHARSET_DIR "../sql/share/charsets"
 #define ER_PREFIX "ER_"
 #define ER_PREFIX2 "MARIA_ER_"
@@ -85,7 +85,6 @@ struct languages
 {
   char *lang_long_name;				/* full name of the language */
   char *lang_short_name;			/* abbreviation of the lang. */
-  char *charset;				/* Character set name */
   struct languages *next_lang;			/* Pointer to next language */
 };
 
@@ -329,7 +328,7 @@ static int create_sys_files(struct languages *lang_head,
                             uint error_count)
 {
   FILE *to;
-  uint csnum= 0, i, row_nr;
+  uint i, row_nr;
   ulong length;
   uchar head[HEADER_LENGTH];
   char outfile[FN_REFLEN], *outfile_end;
@@ -345,16 +344,6 @@ static int create_sys_files(struct languages *lang_head,
   */
   for (tmp_lang= lang_head; tmp_lang; tmp_lang= tmp_lang->next_lang)
   {
-
-    /* setting charset name */
-    if (!(csnum= get_charset_number(tmp_lang->charset, MY_CS_PRIMARY,
-                                    MYF(MY_UTF8_IS_UTF8MB3))))
-    {
-      fprintf(stderr, "Unknown charset '%s' in '%s'\n", tmp_lang->charset,
-	      TXTFILE);
-      DBUG_RETURN(1);
-    }
-
     outfile_end= strxmov(outfile, DATADIRECTORY, 
                          tmp_lang->lang_long_name, NullS);
     if (!my_stat(outfile, &stat_info,MYF(0)))
@@ -410,7 +399,6 @@ static int create_sys_files(struct languages *lang_head,
     int2store(head + 10, max_error);            /* Max error */
     int2store(head + 12, row_nr);
     int2store(head + 14, section_count);
-    head[30]= csnum;
 
     my_fseek(to, 0l, MY_SEEK_SET, MYF(0));
     if (my_fwrite(to, (uchar*) head, HEADER_LENGTH, MYF(MY_WME | MY_FNABP)) ||
@@ -450,7 +438,6 @@ static void clean_up(struct languages *lang_head, struct errors *error_head)
     next_language= tmp_lang->next_lang;
     my_free(tmp_lang->lang_short_name);
     my_free(tmp_lang->lang_long_name);
-    my_free(tmp_lang->charset);
     my_free(tmp_lang);
   }
 
@@ -1113,12 +1100,6 @@ static struct languages *parse_charset_string(char *str)
       DBUG_RETURN(0);				/* OOM: Fatal error */
     DBUG_PRINT("info", ("short_name: %s", new_lang->lang_short_name));
 
-    /* getting the charset name */
-    str= skip_delimiters(str);
-    if (!(new_lang->charset= get_word(&str)))
-      DBUG_RETURN(0);				/* Fatal error */
-    DBUG_PRINT("info", ("charset: %s", new_lang->charset));
-
     /* skipping space, tab or "," */
     str= skip_delimiters(str);
   }

sql/derror.cc

@@ -258,7 +258,7 @@ static File open_error_msg_file(const char *file_name, const char *language,
     goto err;
   error_pos=2;
   if (head[0] != (uchar) 254 || head[1] != (uchar) 254 ||
-      head[2] != 2 || head[3] != 4)
+      head[2] != 2 || head[3] != 5)
     goto err; /* purecov: inspected */
 
   ret->text_length= uint4korr(head+6);

sql/share/errmsg-utf8.txt

@@ -1,4 +1,4 @@
-languages bulgarian=bgn cp1251, chinese=chi gbk, czech=cze latin2, danish=dan latin1, dutch=nla latin1, english=eng latin1, estonian=est latin7, french=fre latin1, georgian=geo utf8mb3, german=ger latin1, greek=greek greek, hindi=hindi utf8mb3, hungarian=hun latin2, italian=ita latin1, japanese=jpn ujis, korean=kor euckr, norwegian-ny=norwegian-ny latin1, norwegian=nor latin1, polish=pol latin2, portuguese=por latin1, romanian=rum latin2, russian=rus koi8r, serbian=serbian cp1250, slovak=slo latin2, spanish=spa latin1, swedish=swe latin1, ukrainian=ukr koi8u;
+languages bulgarian=bgn, chinese=chi, czech=cze, danish=dan, dutch=nla, english=eng, estonian=est, french=fre, georgian=geo, german=ger, greek=greek, hindi=hindi, hungarian=hun, italian=ita, japanese=jpn, korean=kor, norwegian-ny=norwegian-ny, norwegian=nor, polish=pol, portuguese=por, romanian=rum, russian=rus, serbian=serbian, slovak=slo, spanish=spa, swedish=swe, ukrainian=ukr;
 
 default-language eng