version up : gzip 1.8. drop obsolete patch.

component/gzip/buildout.cfg

 [buildout]
 extends =
-  ../patch/buildout.cfg
   ../xz-utils/buildout.cfg
 parts =
   gzip
 
 [gzip]
 recipe = slapos.recipe.cmmi
-url = ftp://ftp.gnu.org/pub/gnu/gzip/gzip-1.6.tar.xz
-md5sum = da981f86677d58a106496e68de6f8995
+url = ftp://ftp.gnu.org/pub/gnu/gzip/gzip-1.8.tar.xz
+md5sum = f7caabb65cddc1a4165b398009bd05b9
 environment =
-  PATH=${patch:location}/bin:${xz-utils:location}/bin:%(PATH)s
-patch-options = -p1
-# The --rsyncable patch is from debian/ubuntu,
-# specifically https://launchpad.net/ubuntu/+source/gzip/1.6-3ubuntu1
-# It is required to minimize the bandwidth used by rsync.
-# For an explanation, see http://beeznest.wordpress.com/2005/02/03/rsyncable-gzip/
-# Hunks for .texi files have been removed to avoid a dependency on makeinfo.
-patches =
-  ${:_profile_base_location_}/rsyncable.diff#0587af03a5580e2b7b4007469ee2b601
-
+  PATH=${xz-utils:location}/bin:%(PATH)s