Play nice with regular web server on esp32

Include the regular web server first and then the Async in your sketch

src/ESPAsyncWebServer.h

@@ -51,6 +51,7 @@ class AsyncStaticWebHandler;
 class AsyncCallbackWebHandler;
 class AsyncResponseStream;
 
+#ifndef WEBSERVER_H
 typedef enum {
   HTTP_GET     = 0b00000001,
   HTTP_POST    = 0b00000010,
@@ -61,6 +62,8 @@ typedef enum {
   HTTP_OPTIONS = 0b01000000,
   HTTP_ANY     = 0b01111111,
 } WebRequestMethod;
+#endif
+
 typedef uint8_t WebRequestMethodComposite;
 typedef std::function<void(void)> ArDisconnectHandler;