[tlbuild] makejvf.test test failures

[Hironobu Yamashita]

> I'm not sure this test failure can be solved by modifying sources.
> Maybe I should replace test files to avoid such a round-off error?

I hope the attached patch avoids the test failure,
though it may look too ad-hoc.
(It’s still ok on x86_64-darwin and win32.)

Hironobu

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