Use asciidoctor to render the manpage. Closes: #895167

debian/control

@@ -3,7 +3,7 @@ Maintainer: Christoph Biedl <debian.axhn@manchmal.in-ulm.de>
 Homepage: https://bitbucket.org/ripencc/bgpdump/wiki/Home
 Standards-Version: 3.9.8
 Build-Depends: debhelper (>= 9~),
-    asciidoc,
+    asciidoctor,
     dh-autoreconf,
     libbsd-dev,
     libbz2-dev,

debian/rules

@@ -55,5 +55,5 @@ override_dh_install:
 	rm -rf debian/bgpdump/usr/include/
 
 override_dh_installman:
-	a2x --format=manpage --no-xmllint debian/bgpdump.txt
+	asciidoctor --attribute reproducible --backend=manpage debian/bgpdump.txt
 	dh_installman