Stop copying an old ostree-trivial-httpd.xml from debian/dist/ into source tree

Upstream distributes it again.

debian/rules

@@ -8,13 +8,8 @@ export LC_ALL=C.UTF-8
 %:
 	dh $@ --with=gir
 
-override_dh_auto_clean:
-	rm -f man/ostree-trivial-httpd.xml
-	if [ -e Makefile ]; then dh_auto_clean; fi
-
 override_dh_autoreconf:
 	env NOCONFIGURE=1 dh_autoreconf ./autogen.sh
-	cp debian/dist/ostree-trivial-httpd.xml man/
 
 configure_options = \
 	--enable-installed-tests \