duplicate build path added if resouce directory is the same as java source dir

This is a problem in MPECLIPSE-47, committed a few hours ago:
if your pom declares the same directory both in sourceDirectory and in
resources (common for .properties files)

<build>
<sourceDirectory>src/java</sourceDirectory>
<resources>
<resource>
<directory>src/java</directory>
<includes>
<include>*/.properties</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>

the resulting .classpath file has duplicate entries and eclipse complains about it.