MinGW now has _mktemp_s, use overload with size parameter
MinGW now has _mktemp_s, use overload with size parameter

MSVC also used the custom implementation, since the function isn't a
macro and therefore

  #ifndef _mktemp_s

didn't work as intended.

AoD314/ninja,iwadon/ninja,sgraham/ninja,bradking/ninja,maruel/ninja,Qix-/ninja,sgraham/ninja,maruel/ninja,sgraham/ninja,iwadon/ninja,AoD314/ninja,maruel/ninja,maruel/ninja,Qix-/ninja,Qix-/ninja,bradking/ninja,ninja-build/ninja,bradking/ninja,ninja-build/ninja,ninja-build/ninja,Qix-/ninja,AoD314/ninja,iwadon/ninja,sgraham/ninja,ninja-build/ninja,AoD314/ninja,bradking/ninja,iwadon/ninja