configure: fix typo that enabled mergelibs by default
configure: fix typo that enabled mergelibs by default

The commit message of 0e5f2ea0de71439fe121da47deaba68585541808? didn't
mention this, so I guess flipping over the default was just an accident.

Change-Id: I9078cc56a6064e3498b012848b860c7b414b37e6

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