contrib/jenkins.sh: run "make {distcheck,maintainer-clean}"

Related: OS#3047
Change-Id: I0c7cd8f8b2a3821e5c55fc84b24eca5e199ebbd8
diff --git a/contrib/jenkins.sh b/contrib/jenkins.sh
index 57da9fa..d75beda 100755
--- a/contrib/jenkins.sh
+++ b/contrib/jenkins.sh
@@ -5,3 +5,5 @@
 autoreconf --install --force
 ./configure
 $MAKE $PARALLEL_MAKE
+$MAKE distcheck
+$MAKE maintainer-clean