Return CPU features in Visual Studio builds
Return CPU features in Visual Studio builds

Please note that on other platforms, we keep checking if intrinsics are available.
has_*() means that not only a CPU feature is present, but also that Sodium can
use it.

eburkitt/libsodium,Payshares/libsodium,rustyhorde/libsodium,pmienk/libsodium,pmienk/libsodium,pmienk/libsodium,eburkitt/libsodium,eburkitt/libsodium,rustyhorde/libsodium,Payshares/libsodium,rustyhorde/libsodium,Payshares/libsodium,rustyhorde/libsodium