time/windows/SDL_systime.c: remove minwinbase.h & timezoneapi.h includes

core/windows/SDL_windows.h is included in there, which inludes windows.h
which in turn includes winbase.h, which in turn includes the two already

src/time/windows/SDL_systime.c

@@ -23,8 +23,6 @@
 #ifdef SDL_TIME_WINDOWS
 
 #include "../../core/windows/SDL_windows.h"
-#include <minwinbase.h>
-#include <timezoneapi.h>
 
 #include "../SDL_time_c.h"