Make the constexpr mutex constructor opt-in #4000
Merged
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... via defining
_ENABLE_CONSTEXPR_MUTEX_CONSTRUCTOR
, instead of opt-out via_DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR
. This avoids potential breakage until we can update the VCLibs UWP framework libraries. Doing so in time for 17.8 is probably impossible at this late stage; we'll get this straightened out and enabled by default for 17.9.