DOXYGEN has nothing to do here, just remove this strange "#if defined(DOXYGEN)"

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1912663 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/modules/http2/h2_proxy_session.c b/modules/http2/h2_proxy_session.c
index db22301..3faa691 100644
--- a/modules/http2/h2_proxy_session.c
+++ b/modules/http2/h2_proxy_session.c
@@ -789,7 +789,7 @@
     apr_socket_t *s;
     
     s = ap_get_conn_socket(session->c);
-#if (!defined(WIN32) && !defined(NETWARE)) || defined(DOXYGEN)
+#if !defined(WIN32) && !defined(NETWARE)
     if (s) {
         ap_sock_disable_nagle(s);
     }