headers: crt: disable some character APIs in winstore builds

They are not allowed (as far as 2016 doc goes):
https://docs.microsoft.com/en-us/cpp/cppcx/crt-functions-not-supported-in-universal-windows-platform-apps?view=vs-2019

"Multi-byte strings are not supported in Windows 8.x Store apps."
"Multi-byte strings are not supported in UWP apps."

Signed-off-by: Liu Hao <lh_mouse@126.com>
2 files changed