fix unused variable build error

Signed-off-by: h2parson <h2parson@uwaterloo.ca>

Author: h2parson

tests/vectors_sig.c

@@ -298,13 +298,13 @@ static OQS_STATUS sig_kg_vector(const char *method_name,
 	return ret;
 }
 
-#if defined(OQS_ENABLE_SIG_ml_dsa_44) || defined(OQS_ENABLE_SIG_ml_dsa_65) || defined(OQS_ENABLE_SIG_ml_dsa_87)
+#if defined(OQS_ENABLE_SIG_ml_dsa_44) || defined(OQS_ENABLE_SIG_ml_dsa_65) || defined(OQS_ENABLE_SIG_ml_dsa_87) || defined(OQS_ENABLE_SIG_SLH_DSA)
 static int sig_ver_vector(const char *method_name,
                           const uint8_t *sigVer_pk_bytes,
                           const uint8_t *sigVer_msg_bytes,
                           size_t msgLen,
                           const uint8_t *sigVer_sig_bytes, int testPassed,
-                          size_t sigLen) {
+                          __attribute__((unused)) size_t sigLen) {
 
 	FILE *fh = NULL;
 	OQS_SIG *sig = NULL;
@@ -374,7 +374,8 @@ static int sig_ver_vector_ext(const char *method_name,
                               size_t msgLen,
                               const uint8_t *sigVer_sig_bytes,
                               const uint8_t *sigVer_ctx, size_t sigVer_ctxLen,
-                              int testPassed, size_t sigLen) {
+                              int testPassed, 
+							  __attribute__((unused)) size_t sigLen) {
 
 	FILE *fh = NULL;
 	OQS_SIG *sig = NULL;