Packaging cleanup

* Declare compliance with policy 4.7.0
* Follow transition of pkg-config
* Add a lintian override

debian/control

@@ -1,7 +1,7 @@
 Source: tang
 Maintainer: Christoph Biedl <debian.axhn@manchmal.in-ulm.de>
 Homepage: https://github.com/latchset/tang
-Standards-Version: 4.6.2
+Standards-Version: 4.7.0
 Vcs-Browser: https://git.in-ulm.de/cbiedl/tang
 Vcs-Git: https://git.in-ulm.de/cbiedl/tang.git
 Build-Depends: debhelper-compat (= 13),
@@ -13,7 +13,7 @@ Build-Depends: debhelper-compat (= 13),
     libjansson-dev,
     libjose-dev,
     meson,
-    pkg-config,
+    pkgconf,
 Priority: optional
 Rules-Requires-Root: no
 Section: net

debian/tang-common.lintian-overrides

@@ -0,0 +1,3 @@
+
+# This is general documentation about tang
+tang-common: spare-manual-page [usr/share/man/man8/tang.8.gz]