Require zlib to be pre-compiled, and rely upon the srclib/zlib/
  tree to contain zlib.lib and our .h files.

  This presumes that zlib is compiled to be compatible with Apache
  (msvcrt build, either statics or as zlib1.dll).  It's true of
  all 1.2.1 zlibs and later.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@104690 13f79535-47bb-0310-9956-ffa450edef68