Add option to disable hostname check (#399)

* Suppress compiler warnings about unused elements.

* Enable CMake's compilation database.

* Add TLS option to disable checking a certificate's host name.

* Add `--disable-hostname-validation` to `ws`.

* Add test for disabling hostname validation.

ixwebsocket/IXSocketTLSOptions.h

@@ -33,6 +33,9 @@ namespace ix
         // whether tls is enabled, used for server code
         bool tls = false;
 
+        // whether to skip validating the peer's hostname against the certificate presented
+        bool disable_hostname_validation = false;
+
         bool hasCertAndKey() const;
 
         bool isUsingSystemDefaults() const;