Revert "bugfix: applied the patch to fix a new regression in nginx 1.7.7's ngx_gzip and ngx_gunzip modules that could lead to request hang when the downstream is slow to write to."

This reverts commit b6d3a5cf7b.

patches/nginx-1.7.7-gzip_gunzip_flush.patch

@@ -1,40 +0,0 @@
-# HG changeset patch
-# User Yichun Zhang <agentzh@gmail.com>
-# Date 1414804249 25200
-#      Fri Oct 31 18:10:49 2014 -0700
-# Node ID 38a74e59f199edafad0a8caae5cfc921ab3302e8
-# Parent  dff86e2246a53b0f4a61935cd5c8c0a0f66d0ca2
-Gzip Gunzip: always flush busy bufs when the incoming chain is NULL.
-
-After the system send buffer is full, NULL incoming chains are used to
-flush pending output upon new write events. The current gzip and gunzip
-filters may intercept NULL chains and keep the data stalling in
-nginx's own send buffers, leading to request hanging (until send
-timeout).
-
-This regression had appeared in nginx 1.7.7.
-
-diff -r dff86e2246a5 -r 38a74e59f199 src/http/modules/ngx_http_gunzip_filter_module.c
---- a/src/http/modules/ngx_http_gunzip_filter_module.c	Mon Aug 25 13:41:31 2014 +0400
-+++ b/src/http/modules/ngx_http_gunzip_filter_module.c	Fri Oct 31 18:10:49 2014 -0700
-@@ -200,7 +200,7 @@ ngx_http_gunzip_body_filter(ngx_http_req
-         }
-     }
- 
--    if (ctx->nomem) {
-+    if (ctx->nomem || in == NULL) {
- 
-         /* flush busy buffers */
- 
-diff -r dff86e2246a5 -r 38a74e59f199 src/http/modules/ngx_http_gzip_filter_module.c
---- a/src/http/modules/ngx_http_gzip_filter_module.c	Mon Aug 25 13:41:31 2014 +0400
-+++ b/src/http/modules/ngx_http_gzip_filter_module.c	Fri Oct 31 18:10:49 2014 -0700
-@@ -373,7 +373,7 @@ ngx_http_gzip_body_filter(ngx_http_reque
-         r->connection->buffered |= NGX_HTTP_GZIP_BUFFERED;
-     }
- 
--    if (ctx->nomem) {
-+    if (ctx->nomem || in == NULL) {
- 
-         /* flush busy buffers */
- 

util/mirror-tarballs

@@ -277,13 +277,6 @@ if [ "$answer" = "N" ]; then
     echo
 fi
 
-answer=`$root/util/ver-ge "$main_ver" 1.7.7`
-if [ "$answer" = "Y" ]; then
-    echo "$info_txt applying the gzip_gunzip_flush patch for nginx"
-    patch -p1 < $root/patches/nginx-$main_ver-gzip_gunzip_flush.patch || exit 1
-    echo
-fi
-
 rm -f *.patch || exit 1
 
 cd .. || exit 1