Add some OpenSSL compat error strings.

Author: anhu

src/internal.c

@@ -23963,8 +23963,6 @@ const char* wolfSSL_ERR_reason_error_string(unsigned long e)
 #ifdef OPENSSL_EXTRA
     case 0 :
         return "ok";
-    case -WOLFSSL_X509_V_ERR_CERT_REVOKED :
-        return "certificate revoked";
 #endif
 
     case UNSUPPORTED_SUITE :
@@ -24411,10 +24409,37 @@ const char* wolfSSL_ERR_reason_error_string(unsigned long e)
     case HTTP_APPSTR_ERR:
         return "HTTP Application string error";
 #endif
-#ifdef OPENSSL_EXTRA
+#if defined(OPENSSL_EXTRA) || defined(OPENSSL_EXTRA_X509_SMALL) || \
+    defined(HAVE_WEBSERVER)
+    /* TODO: -WOLFSSL_X509_V_ERR_CERT_SIGNATURE_FAILURE. Conflicts with 
+     *       -WOLFSSL_ERROR_WANT_CONNECT. */
+    case -WOLFSSL_X509_V_ERR_CERT_NOT_YET_VALID:
+        return "certificate not yet valid";
+    case -WOLFSSL_X509_V_ERR_CERT_HAS_EXPIRED:
+        return "certificate has expired";
+    case -WOLFSSL_X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
+        return "certificate signature failure";
+    case -WOLFSSL_X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
+        return "format error in certificate's notAfter field";
+    case -WOLFSSL_X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
+        return "self-signed certificate in certificate chain";
     case -WOLFSSL_X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
         return "unable to get local issuer certificate";
-#endif
+    case -WOLFSSL_X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
+        return "unable to verify the first certificate";
+    case -WOLFSSL_X509_V_ERR_CERT_CHAIN_TOO_LONG:
+        return "certificate chain too long";
+    case -WOLFSSL_X509_V_ERR_CERT_REVOKED:
+        return "certificate revoked";
+    case -WOLFSSL_X509_V_ERR_INVALID_CA:
+        return "invalid CA certificate";
+    case -WOLFSSL_X509_V_ERR_PATH_LENGTH_EXCEEDED:
+        return "path length constraint exceeded";
+    case -WOLFSSL_X509_V_ERR_CERT_REJECTED:
+        return "certificate rejected";
+    case -WOLFSSL_X509_V_ERR_SUBJECT_ISSUER_MISMATCH:
+        return "subject issuer mismatch";
+#endif /* OPENSSL_EXTRA || OPENSSL_EXTRA_X509_SMALL || HAVE_WEBSERVER */
     case UNSUPPORTED_PROTO_VERSION:
         #ifdef OPENSSL_EXTRA
         return "WRONG_SSL_VERSION";