Compilation failure with msvc-14.0

[pdimov]

compile-c-c++ bin.v2\libs\fiber\build\msvc-14.0\release\address-model-64\link-static\threading-multi\waker.obj
waker.cpp
.\boost/fiber/detail/spinlock_ttas_adaptive.hpp(48): error C2039: 'min': is not a member of 'std'

[olk]

Could you fetch the commit and test it again, please.

[pdimov]

This commit fixes the link=static build under msvc-14.0 (link=shared is still affected by the Intrusive issue.)

Don't merge it to master yet though, because master is frozen; wait for @mclow 's permission.

[olk]

ty