Replace C++ style comments with C comments so it compiles with `gcc -ansi -Wall`

http_parser.c

@@ -600,7 +600,7 @@ size_t http_parser_execute (http_parser *parser,
         if (ch == ' ' && matcher[index] == '\0') {
           state = s_req_spaces_before_url;
         } else if (ch == matcher[index]) {
-          ; // nada
+          ; /* nada */
         } else if (parser->method == HTTP_CONNECT) {
           if (index == 1 && ch == 'H') {
             parser->method = HTTP_CHECKOUT;
@@ -772,7 +772,7 @@ size_t http_parser_execute (http_parser *parser,
 
         switch (ch) {
           case '?':
-            break; // XXX ignore extra '?' ... is this right?
+            break; /* XXX ignore extra '?' ... is this right? */
           case ' ':
             CALLBACK(url);
             state = s_req_http_start;
@@ -802,7 +802,7 @@ size_t http_parser_execute (http_parser *parser,
 
         switch (ch) {
           case '?':
-            // allow extra '?' in query string
+            /* allow extra '?' in query string */
             break;
           case ' ':
             CALLBACK(url);
@@ -1376,7 +1376,7 @@ size_t http_parser_execute (http_parser *parser,
           }
         }
 
-        // Exit, the rest of the connect is in a different protocol.
+        /* Exit, the rest of the connect is in a different protocol. */
         if (parser->upgrade) {
           CALLBACK2(message_complete);
           return (p - data);