Remove psuedo-UTF8 encoding.

It's less efficient on average that base64 (150% vs 133%). It's
non-standard (0 shifted to 256 before encoding). And I rarely use it.

utils/websocket.h

@@ -16,10 +16,6 @@ typedef struct {
     char *cert;
 } settings_t;
 
-typedef struct {
-    int do_b64encode;
-} client_settings_t;
-
 typedef struct {
     char path[1024+1];
     char host[1024+1];