make cache dir configurable via system property (FELIX-1595)


git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@815205 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/sigil/bldcommon/ivysettings.xml b/sigil/bldcommon/ivysettings.xml
index e11ec78..d5c18d8 100644
--- a/sigil/bldcommon/ivysettings.xml
+++ b/sigil/bldcommon/ivysettings.xml
@@ -18,7 +18,7 @@
   under the License.
 -->
 <ivysettings>
-  <properties file="${ivy.settings.dir}/build.properties"/>
+  <properties file="${ivy.settings.dir}/build.properties" override="false"/>
   <caches defaultCacheDir="${cache.dir}/all" />
 
   <settings defaultResolver="default" circularDependencyStrategy="error" />
@@ -58,7 +58,6 @@
         <ivy pattern="${repository.dir}/shared/${repository.pattern}" />
         <artifact pattern="${repository.dir}/shared/${repository.pattern}" />
       </filesystem>
-
     </chain>
 
     <url name="eclipse">