Corrections of the codepage number for some collations.

According to https://msdn.microsoft.com/en-us/library/windows/desktop/dd317756(v=vs.85).aspx code page for latin1 is 1252, and not 850. The same for some other collations.
Changed "auto" charset detection to use only GetACP() on windows.
Since I guess C/ODBC is the only user of that feature, and because GetConsoleCP() returns OEM codepage, and not the default system codepage, which is used by DM as source codepage for recoding to unicode.

libmariadb/ma_charset.c

@@ -549,8 +549,8 @@ const MARIADB_CHARSET_INFO mariadb_compiled_charsets[] =
   {   3, 1, "dec8", "dec8_swedisch_ci", "", 0, "DEC", 1, 1, NULL, NULL},
   {   4, 1, "cp850", "cp850_general_ci", "", 850, "CP850", 1, 1, NULL, NULL},
   {   6, 1, "hp8", "hp8_english_ci", "", 0, "HP-ROMAN8", 1, 1, NULL, NULL},
-  {   7, 1, "koi8r", "koi8r_general_ci", "", 878, "KOI8R", 1, 1, NULL, NULL},
-  {   8, 1, "latin1", "latin1_swedish_ci", "", 850, "LATIN1", 1, 1, NULL, NULL},
+  {   7, 1, "koi8r", "koi8r_general_ci", "", 20866, "KOI8R", 1, 1, NULL, NULL},
+  {   8, 1, "latin1", "latin1_swedish_ci", "", 1252, "LATIN1", 1, 1, NULL, NULL},
   {   9, 1, "latin2", "latin2_general_ci", "", 852, "LATIN2", 1, 1, NULL, NULL},
   {  10, 1, "swe7", "swe7_swedish_ci", "", 20107, "", 1, 1, NULL, NULL},
   {  11, 1, "ascii", "ascii_general_ci", "", 1252, "ASCII", 1, 1, NULL, NULL},
@@ -559,7 +559,7 @@ const MARIADB_CHARSET_INFO mariadb_compiled_charsets[] =
   {  16, 1, "hebrew", "hebrew_general_ci", "", 1255, "HEBREW", 1, 1, NULL, NULL},
   {  18, 1, "tis620", "tis620_thai_ci", "", 874, "TIS620", 1, 1, NULL, NULL},
   {  19, 1, "euckr", "euckr_korean_ci", "", 51949, "EUCKR", 1, 2, mysql_mbcharlen_euckr, check_mb_euckr},
-  {  22, 1, "koi8u", "koi8u_general_ci", "", 20866, "KOI8U", 1, 1, NULL, NULL},
+  {  22, 1, "koi8u", "koi8u_general_ci", "", 21866, "KOI8U", 1, 1, NULL, NULL},
   {  24, 1, "gb2312", "gb2312_chinese_ci", "", 936, "GB2312", 1, 2, mysql_mbcharlen_gb2312, check_mb_gb2312},
   {  25, 1, "greek", "greek_general_ci", "", 28597, "GREEK", 1, 1, NULL, NULL},
   {  26, 1, "cp1250", "cp1250_general_ci", "", 1250, "CP1250", 1, 1, NULL, NULL},
@@ -583,16 +583,16 @@ const MARIADB_CHARSET_INFO mariadb_compiled_charsets[] =
   {  95, 1, "cp932", "cp932_japanese_ci", "", 932, "CP932", 1, 2, mysql_mbcharlen_cp932, check_mb_cp932},
   {  97, 1, "eucjpms", "eucjpms_japanese_ci", "", 932, "EUC-JP-MS", 1, 3, mysql_mbcharlen_eucjpms, check_mb_eucjpms},
   {   2, 1, "latin2", "latin2_czech_cs", "", 852, "LATIN2", 1, 1, NULL, NULL},
-  {   5, 1, "latin1", "latin1_german_ci", "", 850, "LATIN1", 1, 1, NULL, NULL},
+  {   5, 1, "latin1", "latin1_german_ci", "", 1252, "LATIN1", 1, 1, NULL, NULL},
   {  14, 1, "cp1251", "cp1251_bulgarian_ci", "", 1251, "CP1251", 1, 1, NULL, NULL},
-  {  15, 1, "latin1", "latin1_danish_ci", "", 850, "LATIN1", 1, 1, NULL, NULL},
+  {  15, 1, "latin1", "latin1_danish_ci", "", 1252, "LATIN1", 1, 1, NULL, NULL},
   {  17, 1, "filename", "filename", "", 0, "", 1, 5, NULL, NULL},
   {  20, 1, "latin7", "latin7_estonian_cs", "", 28603, "LATIN7", 1, 1, NULL, NULL},
   {  21, 1, "latin2", "latin2_hungarian_ci", "", 852, "LATIN2", 1, 1, NULL, NULL},
   {  23, 1, "cp1251", "cp1251_ukrainian_ci", "", 1251, "CP1251", 1, 1, NULL, NULL},
   {  27, 1, "latin2", "latin2_croatian_ci", "", 852, "LATIN2", 1, 1, NULL, NULL},
   {  29, 1, "cp1257", "cp1257_lithunian_ci", "", 1257, "CP1257", 1, 1, NULL, NULL},
-  {  31, 1, "latin1", "latin1_german2_ci", "", 850, "LATIN1", 1, 1, NULL, NULL},
+  {  31, 1, "latin1", "latin1_german2_ci", "", 1252, "LATIN1", 1, 1, NULL, NULL},
   {  34, 1, "cp1250", "cp1250_czech_cs", "", 1250, "CP1250", 1, 1, NULL, NULL},
   {  42, 1, "latin7", "latin7_general_cs", "", 28603, "LATIN7", 1, 1, NULL, NULL},
   {  43, 1, "macce", "macce_bin", "", 10029, "CP1282", 1, 1, NULL, NULL},
@@ -1349,8 +1349,7 @@ const char *madb_get_os_character_set()
   char *p= NULL;
 #ifdef _WIN32
   char codepage[FN_REFLEN];
-  snprintf(codepage, FN_REFLEN, "%u", GetConsoleWindow() ?
-           GetConsoleCP() : GetACP());
+  snprintf(codepage, FN_REFLEN, "%u", GetACP());
   p= codepage;
 #elif defined(HAVE_NL_LANGINFO) && defined(HAVE_SETLOCALE)
   if (setlocale(LC_CTYPE, ""))