Fix warnings (#1944)

src/libespeak-ng/numbers.c

@@ -1682,7 +1682,7 @@ static int TranslateNumber_1(Translator *tr, char *word, char *ph_out, unsigned
 		if (prev_thousands == 0) {
 			if ((decimal_point == 0) && (ordinal == 0)) {
 				// Look for special pronunciation for this number in isolation (LANG=kl)
-				sprintf(string, "_%dn", value);
+				sprintf(string, "_%ldn", value);
 				if (Lookup(tr, string, ph_out))
 					return 1;
 			}

tests/api.c

@@ -572,6 +572,8 @@ static int
 _test_espeak_ng_phoneme_events_cb(short *samples, int num_samples, espeak_EVENT *events) {
 	char *out = events->user_data;
 	size_t offset;
+	(void) samples;
+	(void) num_samples;
 	for (espeak_EVENT *e = events; e->type != 0; e++) {
 		if (e->type == espeakEVENT_PHONEME) {
 			if (out[0] == 0) offset = 0;