Fix Time on win32

[RX14]

cc @straight-shoota, you wrote this original code

in src/crystal/system/win32/time.cr:116: no overload matches 'Time.utc' with types Int32, UInt16, Int32, UInt16, UInt16, UInt16
Overloads are:
 - Time.utc(year : Int32, month : Int32, day : Int32, hour : Int32 = 0, minute : Int32 = 0, second : Int32 = 0, *, nanosecond : Int32 = 0)
 - Time.utc(*, seconds : Int64, nanoseconds : Int32)

    time = ::Time.utc(year, systemtime.wMonth, day, systemtime.wHour, systemtime.wMinute, systemtime.wSecond)
                  ^~~

[Sija]

I think that's a regression caused by #6118.

[RX14]

And #5819, actually