Remove zlib from the llvm tarball.  This is only used (in theory by povray-31
which is part of llvm-test).  If anyone is interested in adding it to llvm-test,
feel free to go for it.

This is part of PR417


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18277 91177308-0d34-0410-b5e6-96231b3b80d8
117 files changed