test-module-imports.t fails on OS X 10.8 (on buildbot)

[Simon Heimberg]

first test failure:
http://hgbuildbot.kublai.com/builders/OS%20X%2010.8%20hg%20tests/builds/47/steps/run-tests.py%20%28python2.7%29/logs/stdio 
<http://hgbuildbot.kublai.com/builders/OS%20X%2010.8%20hg%20tests/builds/49/steps/run-tests.py%20%28python2.7%29/logs/stdio>

The test was introduced in 05626e87489c (the last changeset before the 
build started.)

(The failure of test-subrepo-git.t is unrelated, it already is there 
since build 42, or build 32 in stable.)