restore gb_ExternalProject_use_unpacked, with diff. purpose
restore gb_ExternalProject_use_unpacked, with diff. purpose

Change-Id: I7d7cbe85219615f80069155a954f917781bc5b71

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