[ide-1.5.x-gui-refactor] Typo in arduino-core ant build file

[wayoda]

Refers to Commit b2b5763

In file arduino-core/build.xml

    <target name="clean" description="Clean out the build directories">
        <delete dir="bin" />
        <delete file="arudino-core.jar" />
    </target>

there is a typo in target clean
arudino-core.jar should be arduino-core.jar instead

[ffissore]

Fixed. Thanks for the heads up