Fix srcdir for the jrcs build target.

Since the old srcdir was a parent of the actual source root, Ant got
confused and always rebuilt jrcs, also in incremental builds when
jrcs hadn't been changed. Now, incremental builds will only rebuild
it if something has changed in the jrcs code.

Author: kahatlen

build.xml

@@ -722,7 +722,7 @@ Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
     <!-- Build our patched JRCS library. -->
     <target name="jrcs" depends="-pre-pre-compile">
         <mkdir dir="${build.dir}/jrcs"/>
-        <javac srcdir="jrcs/src" destdir="${build.dir}/jrcs"
+        <javac srcdir="jrcs/src/main/java" destdir="${build.dir}/jrcs"
              nowarn="on" source="1.4"/>
         <jar destfile="${file.reference.jrcs.jar}">
             <fileset dir="${build.dir}/jrcs" includes="**/*.class"/>