rename SYSTEM_LIBWPG to SYSTEM_WPG to remove specialcasing
rename SYSTEM_LIBWPG to SYSTEM_WPG to remove specialcasing

Change-Id: I7fe4da07852d538216b92b9350903b7022bdc9fa

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