[m-rev.] for review: clarify recompilation.check.m

[Zoltan Somogyi]

For review by anyone.

Does anyone have any experience with debugging failing
test cases in the mmc_make directory? As the log message says,
three test cases still fail there with bootcheck --use-subdirs, but
their logs are far from helpful. Any tips would be appreciated.

Zoltan.
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