Checkstyle config fixed to work with the latest 6.5.0 Checkstyle

See https://github.com/checkstyle/checkstyle/issues/473

h2/src/installer/checkstyle.xml

@@ -55,11 +55,6 @@
         <module name="EmptyStatement"/>
         <module name="EqualsHashCode"/>
         <module name="IllegalInstantiation"/>
-        <module name="RedundantThrows">
-            <property name="allowUnchecked" value="true"/>
-            <property name="allowSubclasses" value="true"/>
-            <property name="suppressLoadErrors" value="true"/>
-        </module>
         <module name="SimplifyBooleanExpression"/>
         <module name="SimplifyBooleanReturn"/>
         <module name="InterfaceIsType"/>