v1.8.0 to use Ethernet_Generic library

### Releases v1.8.0

1. Use new [Ethernet_Generic library](https://github.com/khoih-prog/Ethernet_Generic) as default for W5x00.
2. Rewrite to avoid `multiple-definitions` linker error for multiple-file project
3. Add example [multiFileProject](examples/multiFileProject) to demo how to avoid `multiple-definitions` linker error for multiple-file project
4. Update `Packages' Patches`

Author: khoih-prog

src/EthernetHttpClient_SSL.h

@@ -8,7 +8,7 @@
   
   Built by Khoi Hoang https://github.com/khoih-prog/EthernetWebServer_SSL
        
-  Version: 1.7.8
+  Version: 1.8.0
 
   Version Modified By   Date      Comments
   ------- -----------  ---------- -----------
@@ -24,6 +24,7 @@
   1.7.6   K Hoang      14/03/2022 Fix bug when using QNEthernet staticIP. Add staticIP option to NativeEthernet
   1.7.7   K Hoang      14/03/2022 Change licence from `MIT` to `GPLv3`
   1.7.8   K Hoang      29/03/2022 Sync with `SSLClient` v1.6.11
+  1.8.0   K Hoang      05/04/2022 Use Ethernet_Generic library as default. Support SPI2 for ESP32
  *****************************************************************************************************************************/
 
 // Library to simplify HTTP fetching on Arduino
@@ -32,10 +33,14 @@
 
 #pragma once
 
+#ifndef ETHERNET_HTTP_CLIENT_SSL_H
+#define ETHERNET_HTTP_CLIENT_SSL_H
+
 #include <Arduino.h>
 
 #include "detail/Debug.h"
 #include "Ethernet_HTTPClient/Ethernet_HttpClient.h"
 #include "Ethernet_HTTPClient/Ethernet_WebSocketClient.h"
 #include "Ethernet_HTTPClient/Ethernet_URLEncoder.h"
 
+#endif  // ETHERNET_HTTP_CLIENT_SSL_H