* modules/filters/mod_deflate.c: Remove use of zutil.h (not installed

by zlib 1.2.1) and OS_CODE.  (deflate_out_filter): Simplify to use an
immortal brigade for the gzip header.

PR: 28673


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@105410 13f79535-47bb-0310-9956-ffa450edef68