Avoid WaE (-Wunused-macros) in external libpng
Avoid WaE (-Wunused-macros) in external libpng

Change-Id: I28f36d1855a3a7563083beda992f9803b66e7396

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