also define noexecpt for MSVC - and work around xkeycheck.h
also define noexecpt for MSVC - and work around xkeycheck.h

chr-engwer/Vc,VcDevel/Vc,VcDevel/Vc,chr-engwer/Vc,VcDevel/Vc,VcDevel/Vc,chr-engwer/Vc