use cache.dir property in repos properties


git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@818856 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/sigil/bldcommon/sigil-repos.properties b/sigil/bldcommon/sigil-repos.properties
index a2eb4eb..c9348b0 100644
--- a/sigil/bldcommon/sigil-repos.properties
+++ b/sigil/bldcommon/sigil-repos.properties
@@ -16,17 +16,17 @@
 bld-ant;provider:	filesystem
 bld-ant;level:	1
 bld-ant;recurse:	true
-bld-ant;dir:		${..}/cache/ant/lib
+bld-ant;dir:		${cache.dir:-${..}/cache}/ant/lib
 
 bld-common;provider:	filesystem
 bld-common;level:	2
 bld-common;recurse:	true
-bld-common;dir:		${..}/cache/all
+bld-common;dir:		${cache.dir:-${..}/cache}/all
 
 bld-hack;provider:	filesystem
 bld-hack;level:		3
 bld-hack;recurse:	true
-bld-hack;dir:		${..}/cache/eclipse2
+bld-hack;dir:		${cache.dir:-${..}/cache}/eclipse2
 
 spring;provider:	obr
 spring;level:		4