Fix `DEBUG_POSTFIX` property (#746)
Fix `DEBUG_POSTFIX` property (#746)

The generator expressions here are actually unnecessary, now that I think about it.

This should fix #745
dand-oss/yaml-cpp,jbeder/yaml-cpp,graehl/yaml-cpp,graehl/yaml-cpp,loot/yaml-cpp,loot/yaml-cpp,jbeder/yaml-cpp,WrinklyNinja/yaml-cpp,graehl/yaml-cpp,jbeder/yaml-cpp,graehl/yaml-cpp,jbeder/yaml-cpp,loot/yaml-cpp,loot/yaml-cpp,dand-oss/yaml-cpp,dand-oss/yaml-cpp,WrinklyNinja/yaml-cpp,dand-oss/yaml-cpp,dand-oss/yaml-cpp,WrinklyNinja/yaml-cpp,WrinklyNinja/yaml-cpp,jbeder/yaml-cpp,graehl/yaml-cpp