Add CMAKE_SYSTEM_PROCESSOR variable to prevent this libpng linker error: Undefined symbols for architecture armv7: _png_init_filter_functions_neon, referenced from: _png_init_filter_functions in libpng16d.a(pngrutil.o)
Add CMAKE_SYSTEM_PROCESSOR variable to prevent this libpng linker error: Undefined symbols for architecture armv7: _png_init_filter_functions_neon, referenced from: _png_init_filter_functions in libpng16d.a(pngrutil.o)

leetal/ios-cmake