Make compatible with Java 11

See ukf/ukf-meta#238.

This retains Xalan, but loads it from the classpath instead of the
endorsement mechanism used in earlier versions. This appears to work
(even with the extension classes) from the command line but might not
be stable in container environments, so we still need to move to
excluding Xerces and Xalan in favour of Java stages in the medium term.

build.xml

@@ -1588,7 +1588,6 @@
         The individual properties listed here can be augmented or overridden
         by properties defined in the external properties files, e.g., build.properties.
     -->
-    <property name="mda.java.endorsed.dirs" value="${tools.dir}/endorsed"/>
     <property name="mda.blocklists.dir" value="${blocklists.dir}"/>
     <property name="mda.cacheDuration.aggregate.duration" value="${cacheDuration.aggregate.duration}"/>
     <property name="mda.cacheDuration.perEntity.duration" value="${cacheDuration.perEntity.duration}"/>
@@ -1629,18 +1628,44 @@
                     <pathelement path="${mdx.dir}"/>
 
                     <!-- Include all APIs we may want to use. -->
+
+                    <!-- The Shibboleth MDA. -->
                     <fileset dir="${tools.mda}/lib">
                         <include name="*.jar"/>
                     </fileset>
+
+                    <!-- UK federation MDA beans, and ukf-members. -->
                     <fileset dir="${tools.dir}/ukf-mda">
                         <include name="*.jar"/>
                     </fileset>
-                    <fileset dir="${tools.dir}/xalan/lib">
-                        <include name="sdss-xalan-md-*.jar"/>
-                    </fileset>
+
+                    <!-- InCommon MDA beans. -->
                     <fileset dir="${tools.dir}/inc-mda">
                         <include name="*.jar"/>
                     </fileset>
+
+                    <!-- Support libraries for any of the above. -->
+                    <fileset dir="${tools.dir}/lib">
+                        <include name="*.jar"/>
+                    </fileset>
+
+                    <!--
+                        Use Xalan as our XML processor.
+                        Note: this is not the old endorsement mechanism,
+                        despite the directory name. Instead, we just load
+                        it via the classpath.
+                    -->
+                    <fileset dir="${tools.dir}/xalan/impl">
+                        <include name="*.jar"/>
+                    </fileset>
+
+                    <!--
+                        Xalan-dependent UK federation classes.
+                    -->
+                    <fileset dir="${tools.dir}/xalan/lib">
+                        <include name="sdss-xalan-md-*.jar"/>
+                    </fileset>
+
                 </classpath>
                 <syspropertyset>
                     <propertyset refid="mda.properties"/>