Resolve "Fix "make distcheck""
I seems to be missing one last thing for distcheck to pass. distclean is failing with:
ERROR: files left in build directory after distclean:
./bin/tests/system/statistics/clean.sh
./bin/tests/system/statistics/setup.sh
./bin/tests/system/statistics/ns1/named.conf.in
...
./bin/named/named.conf.rst
./doc/misc/key.grammar.rst
./doc/misc/delegation-only.zoneopt.rst
...
./doc/misc/managed-keys.grammar.rst
./libltdl/.deps/lt__strl.PloBoth bin/tests/system and .rst files are added to the distribution (the dist target) by EXTRA_DIST. libltdl/.deps/lt__strl.Plo is part of the Automake magic.
So far, I fail to see how to remove them when distclean is run from distcheck but to keep them otherwise (e.g. for maintainer-clean).
Closes #1880.