[350157] "cleanup" sometimes cleans up too much

releng.wtpbuilder/scripts/dependency/build.xml

@@ -118,6 +118,7 @@
 
     <target
         name="download"
+        depends="touchDownload"
         if="dependency.file"
         unless="local.cache.file.exists">
         <get
@@ -139,6 +140,7 @@
 
     <target
         name="downloadrepo"
+        depends="touchRepo"
         if="dependency.repo"
         unless="local.cache.repo.exists">
         <get