related to the removal of --without-system-stdlibs option

Change-Id: I46291a2cd648505c47c6f4222aeb73bfbbd3fdc4
Reviewed-on: https://gerrit.libreoffice.org/2259Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>