QMYSQLDriverPlugin: includemocs

Including moc files directly into their classes' TU tends to improve
codegen and enables extended compiler warnings, e.g. about unused
private functions or fields.

Pick-to: 6.3 6.2 5.15
Task-number: QTBUG-102886
Change-Id: Idf1a38d8a293e3cbf74443f00d2a9765eb68a9c0
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/plugins/sqldrivers/mysql/qsql_mysql.cpp

@@ -1555,3 +1555,5 @@ bool QMYSQLDriver::isIdentifierEscaped(const QString &identifier, IdentifierType
 }
 
 QT_END_NAMESPACE
+
+#include "moc_qsql_mysql_p.cpp"