Add Qt 5.12 and 5.13 support

Co-Authored-By: aaronjense <aaron@wolfssl.com>
Co-Authored-By: MJSPollard <mpollard@wolfssl.com>
Co-Authored-By: Quinn Miller <quinnmiller1997@users.noreply.github.com>
Co-Authored-By: Tim Parrish <timparrish@users.noreply.github.com>

wolfcrypt/src/error.c

@@ -512,6 +512,9 @@ const char* wc_GetErrorString(int error)
     case PSS_SALTLEN_RECOVER_E:
         return "PSS - Salt length unable to be recovered";
 
+    case ASN_SELF_SIGNED_E:
+        return "ASN self-signed certificate error";
+
     default:
         return "unknown error number";