fix missing include

after
    commit b2cefc2e36925b4384eb0aea54aa2c6bcfb018a8
    Revert removal of mysql jdbc connector

Change-Id: I379cfba0f36b0e55ea135e5c9eb14a2851fb2881
diff --git a/connectivity/source/drivers/mysql_jdbc/YUser.cxx b/connectivity/source/drivers/mysql_jdbc/YUser.cxx
index f29ba3b..c5031f3 100644
--- a/connectivity/source/drivers/mysql_jdbc/YUser.cxx
+++ b/connectivity/source/drivers/mysql_jdbc/YUser.cxx
@@ -26,6 +26,7 @@
#include <com/sun/star/sdbcx/PrivilegeObject.hpp>
#include <TConnection.hxx>
#include <strings.hrc>
#include <comphelper/types.hxx>

using namespace connectivity;
using namespace connectivity::mysql;