DEB package: decrease minimum debhelper version for compatibility with older Ubuntu releases.

Author: norrisjeremy

pkg/deb/templates/compat

@@ -1 +1 @@
-10
+9

pkg/deb/templates/control.in

@@ -4,7 +4,7 @@ Homepage:          http://www.liberouter.org/
 Section:           libs
 Priority:          optional
 Standards-Version: 3.9.8
-Build-Depends:     debhelper (>= 10), cmake (>= 2.8.8), doxygen, make (>= 4.0),
+Build-Depends:     debhelper (>= 9), cmake (>= 2.8.8), doxygen, make (>= 4.0),
                    gcc (>= 4.8), g++ (>= 4.8), libxml2-dev, pkg-config,
                    liblz4-dev, libzstd-dev