connectivity: use gbuild api for flex (this hide a -Werror problem on Mac)
connectivity: use gbuild api for flex (this hide a -Werror problem on Mac)

Change-Id: I7b5551932db6e3e6037ad4f98ed77a29b4dec5db

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