include debug/optimizing flags when building PCH
include debug/optimizing flags when building PCH

gb_LinkTarget__get_cxxflags is called to add these for each normal
cxx object by gb_LinkTarget_add_(no)exception_object,
so PCH needs them added too.

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