std/os/windows: remove subsystem detection for uefi
std/os/windows: remove subsystem detection for uefi

zig-lang/zig,zig-lang/zig,andrewrk/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,andrewrk/zig,raulgrell/zig,raulgrell/zig