checknlink: return False if .hgtmp file preexists (issue2517)
If os_link fails on Windows, errno is always errno.EINVAL,
so we can't really say if the testlink could not be created
because (a) the FS doesn't support hardlinks or (b) there
is a leaked .hgtmp file lying around from a previous crashed
run.
So let's err on the safe side, keep the code simple and assume
we can't detect hardlinks in both cases.
# When --inotify is activated, help output and config changes:
test-debugcomplete
test-empty
test-fncache
test-globalopts
test-help
test-hgrc
test-inherit-mode
test-qrecord
test-strict
# --inotify activates de facto the inotify extension. It does not play well
# with inotify-specific tests, which activate/desactivate inotify at will:
test-inotify
test-inotify-debuginotify
test-inotify-dirty-dirstate
test-inotify-issue1208
test-inotify-issue1371
test-inotify-issue1542
test-inotify-issue1556
test-inotify-lookup