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asomers
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2017-04-02T02:11:13.377848Z
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MFC r315034

Document that the msun tests require WARNS=0

ATF tests have a default WARNS of 0, unlike other usermode programs.  This
change is technically a noop, but it documents that the msun tests don't
work with any warnings enabled, at least not on all architectures.

Reviewed by:  ngie
MFC after:    3 weeks
Sponsored by: Spectra Logic Corporation
Differential Revision:        https://reviews.freebsd.org/D9933

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