Commit Briefs
mk: avoid infinite loop when targets are repeated
Fixes "mk -f /tmp/x.mk y x" or "mk -f /tmp/x.mk" where /tmp/x.mk is: x y x: f echo hi Change-Id: I7fa87dc4750c04fdba010b990c190722b432b333 Reviewed-on: https://plan9port-review.googlesource.com/1361 Reviewed-by: Russ Cox <rsc@swtch.com>