accounts/scwallet: flag to specify path to smartcard daemon (#19439)

* accounts/scwallet: Add a switch to enable smartcard support

* accounts: change the meaning of the switch

* disable card support in windows until tested
* only activate account if pcscd socket file is present
* the switch is now the path to the socket file

* accounts/scwallet: holiman's review feedback

* accounts/scwallet: send the path to go-pcsclite

* accounts/scwallet: add default, per platform path

* accounts/scwallet: fix error log warning

* accounts/scwallet: update pcsc lib to latest

* accounts/scwallet: use default path from pcsclite

* scwallet: forgot to change switch name

* cmd: minor style cleanups (error handling first, then happy path)

vendor/github.com/gballet/go-libpcsclite/msg.go

@@ -62,7 +62,7 @@ func messageSendWithHeader(command uint32, conn net.Conn, data []byte) error {
 	return err
 }
 
-// ClientSetupSession prepares a communication channel for the client to talk to the server.
+// clientSetupSession prepares a communication channel for the client to talk to the server.
 // This is called by the application to create a socket for local IPC with the
 // server. The socket is associated to the file \c PCSCLITE_CSOCK_NAME.
 /*
@@ -73,6 +73,10 @@ func messageSendWithHeader(command uint32, conn net.Conn, data []byte) error {
  * @retval -1 The socket can not open a connection.
  * @retval -1 Can not set the socket to non-blocking.
  */
-func clientSetupSession() (net.Conn, error) {
-	return net.Dial("unix", PCSCDSockName)
+func clientSetupSession(daemonPath string) (net.Conn, error) {
+	path := PCSCDSockName
+	if len(daemonPath) > 0 {
+		path = daemonPath
+	}
+	return net.Dial("unix", path)
 }