6986772: langtools netbeans build should use ${ant.core.lib} instead of ${ant.home}/lib/ant.jar

Reviewed-by: ohair

make/netbeans/langtools/build.xml

@@ -263,7 +263,8 @@
         <mkdir dir="${build.toolclasses.dir}"/>
         <javac srcdir="${make.tools.dir}/SelectTool"
                destdir="${build.toolclasses.dir}/"
-               classpath="${ant.home}/lib/ant.jar"
+               classpath="${ant.core.lib}"
+               includeantruntime="false"
                debug="${javac.debug}"
                debuglevel="${javac.debuglevel}">
                    <compilerarg line="-Xlint"/>