cmCustomCommand: Record value of CMP0116 at time of creation

Source/cmAddCustomCommandCommand.cxx

Source/cmAddCustomTargetCommand.cxx

Source/cmCPluginAPI.cxx

Source/cmCustomCommand.cxx

Source/cmCustomCommand.h

Source/cmFLTKWrapUICommand.cxx

Source/cmGlobalVisualStudio8Generator.cxx

Source/cmGlobalVisualStudioGenerator.cxx

Source/cmGlobalXCodeGenerator.cxx

Source/cmLocalGenerator.cxx

Source/cmLocalGenerator.h

Source/cmLocalVisualStudio7Generator.cxx

Source/cmMakefile.cxx

Source/cmMakefile.h

Source/cmQTWrapCPPCommand.cxx

Source/cmQTWrapUICommand.cxx

Source/cmQtAutoGenGlobalInitializer.cxx

Source/cmQtAutoGenInitializer.cxx