We don't use anything from my_config.h.

Bug: https://bugs.gentoo.org/632578

--- a/_mysql.c
+++ b/_mysql.c
@@ -40,8 +40,6 @@ PERFORMANCE OF THIS SOFTWARE.
 #include "structmember.h"
 #if defined(MS_WINDOWS)
 #include <config-win.h>
-#else
-#include "my_config.h"
 #endif
 #include "mysql.h"
 #include "mysqld_error.h"