mysql-connector-odbc: add FIXME (it doesn't work)

[00000] [iODBC][Driver Manager]/nix/store/1kx89m5hfw4ldkr8aimai98ba8b99w9k-mysql-connector-odbc-5.2.6/lib/libmyodbc5w.so: undefined symbol: my_thread_end_wait_time (0) (SQLDriverConnect)