ms_printf format attribute should be ISO compliant for ucrt linked gcc

[Julian Waters via Gcc]

Hi all,

Is there a way to make the format attribute when passed ms_printf recognise
ISO C99 and above format specifiers? Currently on Windows gcc always
assumes that printf doesn't recognise specifiers such as %z and %T for
strftime, but for gcc that links against the newer C Runtime from Microsoft
this is no longer true

best regards,
Julian