LibreOfficeLinux.conf: use system zlib
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

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core