Remove the gzip_window param, it is useless.

bin/varnishd/cache/cache_gzip.c

@@ -128,7 +128,7 @@ VGZ_NewGzip(struct vsl_log *vsl, const char *id)
 	i = deflateInit2(&vg->vz,
 	    cache_param->gzip_level,		/* Level */
 	    Z_DEFLATED,				/* Method */
-	    16 + cache_param->gzip_window,	/* Window bits (16=gzip + 15) */
+	    16 + 15,				/* Window bits (16=gzip) */
 	    cache_param->gzip_memlevel,		/* memLevel */
 	    Z_DEFAULT_STRATEGY);
 	assert(Z_OK == i);

bin/varnishd/common/params.h

@@ -185,7 +185,6 @@ struct params {
 	unsigned		http_gzip_support;
 	unsigned		gzip_buffer;
 	unsigned		gzip_level;
-	unsigned		gzip_window;
 	unsigned		gzip_memlevel;
 
 	unsigned		obj_readonly;

bin/varnishd/mgt/mgt_param.c

@@ -1125,11 +1125,6 @@ static const struct parspec input_parspec[] = {
 		"Gzip compression level: 0=debug, 1=fast, 9=best",
 		0,
 		"6", ""},
-	{ "gzip_window", tweak_uint, &mgt_param.gzip_window, 8, 15,
-		"Gzip window size 8=least, 15=most compression.\n"
-		"Memory impact is 8=1k, 9=2k, ... 15=128k.",
-		0,
-		"15", ""},
 	{ "gzip_memlevel", tweak_uint, &mgt_param.gzip_memlevel, 1, 9,
 		"Gzip memory level 1=slow/least, 9=fast/most compression.\n"
 		"Memory impact is 1=1k, 2=2k, ... 9=256k.",

bin/varnishtest/tests/e00022.vtc

@@ -25,7 +25,6 @@ varnish v1 -arg "-p thread_pool_stack=262144" -vcl+backend {
 
 varnish v1 -cliok "param.set esi_syntax 0xc"
 varnish v1 -cliok "param.set http_gzip_support true"
-varnish v1 -cliok "param.set gzip_window 8"
 varnish v1 -cliok "param.set gzip_memlevel 1"
 
 client c1 {