Fix includes windows-specific source
The header strutil.h is two levels above sys/win/command.c, and
SDL_log.h was missing.
#include "../../command.h"
-#include <stdio.h>
-#include "../strutil.h"
+#include <SDL2/SDL_log.h>
+#include "../../strutil.h"
HANDLE cmd_execute(const char *path, const char *const argv[]) {
STARTUPINFO si;
