In function dbd_mysql_init, there have a function call (my_init) which does not export in libmysql.dll
(mysql-connector-c-6.0.2). So we got link error:

apr_dbd_mysql.obj : error LNK2019: unresolved external symbol _my_init referenced in function _dbd_mysql_init
.\Release\apr_dbd_mysql-1.dll : fatal error LNK1120: 1 unresolved externals

As in dbd_mysql_open, we call mysql_init, which call mysql_server_init, then mysql_server_init call my_init,
so we need not to direct call my_init.

This issues exists in 1.3.x, 1.4.x, 1.5.x and trunk.
Index: apr_dbd_mysql.c
--- apr_dbd_mysql.c (revision 943816)
+++ apr_dbd_mysql.c (working copy)
@@ -1284,7 +1284,6 @@

static void dbd_mysql_init(apr_pool_t *pool)
- my_init();

/* FIXME: this is a guess; find out what it really does */