debian/rules: update txt2man invocation

in order to make build reproducible.

Thanks: Daniel Shahaf for the bug report and patch.
Closes: #844236

debian/rules

@@ -34,7 +34,7 @@ DEB_UPSTREAM_TARBALL_MD5 = 13e14932f7b63db5e5dc54f608148c34
 DEB_INSTALL_MANPAGES_weblint-perl := debian/weblint.1
 
 common-build-indep::
-	txt2man -p debian/weblint.txt > debian/weblint.1
+	txt2man -t weblint -s 1 -v "Linux Reference Manual" -r $$(dpkg-parsechangelog -SVersion) debian/weblint.txt > debian/weblint.1
 
 common-binary-post-install-indep::
 	mv debian/libhtml-lint-perl/usr/bin debian/weblint-perl/usr