Update waf (don't crash on waf test when lcov is unavailable)
Update waf (don't crash on waf test when lcov is unavailable)

git-svn-id: fb6d863945102bebb9fe1d25d24b18a16295c170@3288 a436a847-0d15-0410-975c-d299462d15a1

drobilla/ingen,drobilla/ingen,ventosus/ingen,drobilla/ingen,drobilla/ingen,ventosus/ingen,ventosus/ingen,ventosus/ingen