LibreOfficeLinux.conf: use system zlib

It appears that there are some externals that link against the system
zlib anyway, and the assumption is that system zlib will work
everywhere.

Change-Id: Id348ed88d00ec1495aa54871c994062b9e1b3e85

distro-configs/LibreOfficeLinux.conf

@@ -2,7 +2,7 @@
 --with-system-dicts
 --with-myspell-dicts
 --without-unix-wrapper
---without-system-zlib
+--with-system-zlib
 --without-system-poppler
 --without-system-openssl
 --without-system-mesa-headers