Merge pull request #1128 from psgreco/elements-0.21-fixgitian

Fix elements naming in gitian builds

Author: jamesdorfman

contrib/gitian-descriptors/assign_DISTNAME

@@ -5,6 +5,7 @@
 # A helper script to be sourced into the gitian descriptors
 
 if RECENT_TAG="$(git describe --exact-match HEAD)"; then
+    RECENT_TAG="${RECENT_TAG#elements-}"
     VERSION="${RECENT_TAG#v}"
 else
     VERSION="$(git rev-parse --short=12 HEAD)"