lintian: Remove silly build-depends and add source format

Change-Id: Iea8a9918710dfc4c760459aa3335e7370ea1f50f
(cherry picked from commit 4502461cd1ee78a0965d82610552372b4b81c777)
diff --git a/debian/control b/debian/control
index c9fcf88..df575da 100644
--- a/debian/control
+++ b/debian/control
@@ -1,6 +1,6 @@
 Source: mendel-minimal
 Maintainer: Coral <coral-support@google.com>
-Build-Depends: debhelper (>=10), dh-systemd
+Build-Depends: debhelper (>=10)
 Section: misc
 Priority: optional
 Standards-Version: 3.9.8
diff --git a/debian/source/format b/debian/source/format
new file mode 100644
index 0000000..d3827e7
--- /dev/null
+++ b/debian/source/format
@@ -0,0 +1 @@
+1.0