syscall: fix a Y2038 bug by replacing Int32x32To64 with multiplication

Int32x32To64 macro internally truncates the arguments to int32,
while time_t is 64-bit on most/all modern platforms.
Therefore, usage of this macro creates a Year 2038 bug.

syscall.c

@@ -476,7 +476,7 @@ int do_SetFileTime(const char *path, time_t crtime)
 	free(pathw);
 	if (handle == INVALID_HANDLE_VALUE)
 	    return -1;
-	int64 temp_time = Int32x32To64(crtime, 10000000) + 116444736000000000LL;
+	int64 temp_time = (crtime * 10000000LL) + 116444736000000000LL;
 	FILETIME birth_time;
 	birth_time.dwLowDateTime = (DWORD)temp_time;
 	birth_time.dwHighDateTime = (DWORD)(temp_time >> 32);