The symbol my_charset_latin1 is not exported, but upstream uses it probably,
since they use some weird environment with mysql buildroot. Anyway, it is only
used only for case-insensitive comparison of encoding identificators, which
should include only ASCII chars. So we really don't need any charset
information and can use simple case-insensitive strcmp.

However, the only function doing that is defined at driver/utility.c so it
would be better to move it to util/stringutil.c and have it available as
a general purpose function. That's basically what this patch does.

diff -up mysql-connector-odbc-5.2.4-src/driver/utility.c.p5 mysql-connector-odbc-5.2.4-src/driver/utility.c
--- mysql-connector-odbc-5.2.4-src/driver/utility.c.p5	2013-02-25 14:37:53.459350162 +0100
+++ mysql-connector-odbc-5.2.4-src/driver/utility.c	2013-02-25 14:37:53.494350161 +0100
@@ -2239,33 +2239,6 @@ my_bool reget_current_catalog(DBC FAR *d
 
 
 /*
-  @type    : myodbc internal
-  @purpose : compare strings without regarding to case
-*/
-
-int myodbc_strcasecmp(const char *s, const char *t)
-{
-  while (toupper((uchar) *s) == toupper((uchar) *t++))
-    if (!*s++)
-      return 0;
-  return((int) toupper((uchar) s[0]) - (int) toupper((uchar) t[-1]));
-}
-
-
-/*
-  @type    : myodbc internal
-  @purpose : compare strings without regarding to case
-*/
-
-int myodbc_casecmp(const char *s, const char *t, uint len)
-{
-  while (len-- != 0 && toupper(*s++) == toupper(*t++))
-    ;
-  return (int)len + 1;
-}
-
-
-/*
   @type    : myodbc3 internal
   @purpose : logs the queries sent to server
 */
diff -up mysql-connector-odbc-5.2.4-src/util/stringutil.c.p5 mysql-connector-odbc-5.2.4-src/util/stringutil.c
--- mysql-connector-odbc-5.2.4-src/util/stringutil.c.p5	2013-01-24 18:43:33.000000000 +0100
+++ mysql-connector-odbc-5.2.4-src/util/stringutil.c	2013-02-25 14:38:37.263348956 +0100
@@ -905,13 +906,40 @@ static const MY_CSET_OS_NAME charsets[]=
 };
 
 
+/*
+ *   @type    : myodbc internal
+ *   @purpose : compare strings without regarding to case
+ */
+
+int myodbc_strcasecmp(const char *s, const char *t)
+{
+  while (toupper(*s) == toupper(*t++))
+    if (!*s++)
+      return 0;
+  return((int) toupper(s[0]) - (int) toupper(t[-1]));
+}
+
+
+/*
+  @type    : myodbc internal
+  @purpose : compare strings without regarding to case
+*/
+
+int myodbc_casecmp(const char *s, const char *t, uint len)
+{
+  while (len-- != 0 && toupper(*s++) == toupper(*t++))
+    ;
+  return (int)len + 1;
+}
+
+
 const char *
 my_os_charset_to_mysql_charset(const char *csname)
 {
   const MY_CSET_OS_NAME *csp;
   for (csp= charsets; csp->os_name; ++csp)
   {
-    if (!my_strcasecmp(&my_charset_latin1, csp->os_name, csname))
+    if (!myodbc_strcasecmp(csp->os_name, csname))
     {
       switch (csp->param)
       {
diff -up mysql-connector-odbc-5.2.4-src/util/stringutil.h.p5 mysql-connector-odbc-5.2.4-src/util/stringutil.h
--- mysql-connector-odbc-5.2.4-src/util/stringutil.h.p5	2013-01-24 18:43:33.000000000 +0100
+++ mysql-connector-odbc-5.2.4-src/util/stringutil.h	2013-02-25 14:37:53.498350161 +0100
@@ -117,6 +117,8 @@ size_t sqlwcharncat2(SQLWCHAR *dest, con
 SQLWCHAR *sqlwcharncpy(SQLWCHAR *dest, const SQLWCHAR *src, size_t n);
 
 char * myodbc_strlwr(char *target, size_t len);
+int myodbc_strcasecmp(const char *s, const char *t);
+int myodbc_casecmp(const char *s, const char *t, uint len);
 #ifdef __cplusplus
 }
 #endif