thttpclient_ssl: be less specific

The error we're looking for is "certificate verify failed". The routine
that reports this will be different between openssl versions, so it
makes no sense to track the routine name as well.

tests/stdlib/thttpclient_ssl.nim

@@ -125,7 +125,6 @@ when not defined(windows):
         log "client: exception: " & msg
         # SSL_shutdown:shutdown while in init
         if not (msg.contains("alert number 48") or
-          msg.contains("routines:CONNECT_CR_CERT:certificate verify failed") or
-          msg.contains("routines:tls_process_server_certificate:certificate verify failed")):
+          msg.contains("certificate verify failed")):
           echo "CVerifyPeer exception: " & msg
           check(false)