Do not allocate new string when processing HTTP3 request

Author: JakubOnderka

src/ngx_http_modsecurity_rewrite.c

@@ -134,10 +134,15 @@ ngx_http_modsecurity_rewrite_handler(ngx_http_request_t *r)
             case NGX_HTTP_VERSION_11 :
                 http_version = "1.1";
                 break;
-#if defined(nginx_version) && nginx_version >= 1009005
+#ifdef NGX_HTTP_VERSION_20
             case NGX_HTTP_VERSION_20 :
                 http_version = "2.0";
                 break;
+#endif
+#ifdef NGX_HTTP_VERSION_30
+            case NGX_HTTP_VERSION_30 :
+                http_version = "3.0";
+                break;
 #endif
             default :
                 http_version = ngx_str_to_char(r->http_protocol, r->pool);