Fix clean not working properly any more.

'Clean' needs to do a limited init to load property files, so it
can delete the right build/dist directories.

My earlier change to stop ivy running broke this.

Instead, hard code the damn paths, because making it work sanely
is too difficult.

Change-Id: Id795619aef0188f5eb7f95c9e319bebf06654b08
Reviewed-on: http://gerrit.dmdirc.com/3796
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

nbproject/build-impl.xml

@@ -683,8 +683,8 @@ is divided into following sections:
             -->
     <target name="deps-clean" unless="no.deps"/>
     <target name="-do-clean">
-        <delete dir="${build.dir}"/>
-        <delete dir="${dist.dir}"/>
+        <delete dir="build"/>
+        <delete dir="dist"/>
     </target>
     <target name="-post-clean">
         <!-- Empty placeholder for easier customization. -->