configure.ac: remove duplicated flag
configure.ac: remove duplicated flag

Change-Id: I95ee315fe1c10ae95ea0fe940eca4c06a6326447

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