syntax error for msvc-build

[togacure]

Simple patch for system.cpp solve problem:

@@ -272,7 +272,7 @@ bool system_get_pref(const char *name, void * data, int type)
 {
    if (type == SPREF_INT)
    {
-       return os_get_pref_int(name, (int *)data);
+       return os_get_pref_int((char *) name, (int *)data);
    }

    return false;