make.sh: leave around the generated version

For positerity (largely of packagers) lets leave around the generated
version files that happen during build.
They're already ignored in git, and recreated on every build.

Signed-off-by: Vincent Batts <vbatts@redhat.com>

Docker-DCO-1.1-Signed-off-by: Jessie Frazelle <princess@docker.com> (github: jfrazelle)

Docker-DCO-1.1-Signed-off-by: Jessie Frazelle <hugs@docker.com> (github: jfrazelle)
diff --git a/hack/make.sh b/hack/make.sh
index 0db70a7..118d432 100755
--- a/hack/make.sh
+++ b/hack/make.sh
@@ -265,9 +265,6 @@
 		bundle $SCRIPTDIR/make/$bundle
 		echo
 	done
-
-	# if we get all the way through successfully, let's delete our autogenerated code!
-	rm -r autogen
 }
 
 main "$@"