(Backport of an identical change from 5.0)


support-files/mysql.spec.sh:
  We cannot always use the bundled zlib, as this conflicts with the "shared" build of the "max" binary.
  The fully static RPM build on "build" also does not work with the bundled zlib.
  With this change, we use the bundled zlib for "standard" RPMs (unless fully static, "build")
  and the one already installed on the system for the "max" build which is also labeled "experimental".
  (Backport of an identical change from 5.0)