Removes remants of precompiled .jar files from dartc build

compiler/dartc.xml

 <!--
   Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
   for details. All rights reserved. Use of this source code is governed by a
   BSD-style license that can be found in the LICENSE file.
  -->
 <project default="dist">
   <import file="sources.xml"/>
   <import file="test_sources.xml"/>
-  <import file="corelib_sources.xml"/>
-  <import file="compiler_corelib_sources.xml"/>
-  <import file="domlib_sources.xml"/>
-  <import file="htmllib_sources.xml"/>
-  <import file="jsonlib_sources.xml"/>
-  <import file="isolatelib_sources.xml"/>
 
   <!--
     The file build.properties does not exist. If provided, properties can be customized.
   -->
   <property file="build.properties" />
 
   <!--
     Configuration properties.
   -->
   <property name="build.dir" value="out"/>
@@ skipping 105 matching lines @@
 
     <!--
       Re-root the classpaths from third_party into the lib folder of the distro.
     -->
     <pathconvert property="dartc.classpath.runtime.unix" targetos="unix" refid="classpath.runtime">
       <regexpmapper from="${third_party.dir}/(.*)" to="$DARTC_LIBS/\1"/>
     </pathconvert>
 
     <copy file="scripts/dartc.sh" tofile="${dist.dir}/bin/dartc">
       <filterset>
-        <filter token="CLASSPATH" value="$DARTC_LIBS/dartc.jar:$DARTC_LIBS/corelib.jar:$DARTC_LIBS/domlib.jar:$DARTC_LIBS/htmllib.jar:$DARTC_LIBS/jsonlib.jar:$DARTC_LIBS/isolatelib.jar:${dartc.classpath.runtime.unix}"/>
+        <filter token="CLASSPATH" value="$DARTC_LIBS/dartc.jar:${dartc.classpath.runtime.unix}"/>
       </filterset>
     </copy>
     <chmod file="${dist.dir}/bin/dartc" perm="a+rx"/>
 
    <!--
       TODO: The following files are not strictly due to dist, move them out.
     -->
     <copy todir="${build.dir}">
       <fileset dir="scripts">
         <include name="dartc_run.sh"/>
         <include name="dartc_metrics.sh"/>
       </fileset>
       <filterset>
-        <filter token="CLASSPATH" value="$DARTC_LIBS/dartc.jar:$DARTC_LIBS/corelib.jar:$DARTC_LIBS/domlib.jar:$DARTC_LIBS/htmllib.jar:$DARTC_LIBS/jsonlib.jar:$DARTC_LIBS/isolatelib.jar:${dartc.classpath.runtime.unix}"/>
+        <filter token="CLASSPATH" value="$DARTC_LIBS/dartc.jar:${dartc.classpath.runtime.unix}"/>
       </filterset>
     </copy>
     <chmod file="${build.dir}/dartc_run.sh" perm="a+rx"/>
     <chmod file="${build.dir}/dartc_metrics.sh" perm="a+rx"/>
 
     <!--
       Copy of all of the dartc dependencies to the lib folder.
     -->
     <copy todir="${dist.dir}/lib">
       <path refid="classpath.runtime"/>
       <regexpmapper from="${third_party.dir}/(.*)" to="\1"/>
     </copy>
   </target>
 
   <target name="clean" description="Deletes the build output directory.">
     <delete dir="${build.dir}"/>
     <delete dir="${dist.dir}"/>
   </target>
 
   <target name="tests.jar" depends="compile-tests">
     <jar destfile="${build.dir}/tests.jar" basedir="${build.test.classes.dir}"/>
   </target>
 </project>