Get rid of almost all uses of these definitions. They're still defined for delinquent out-of-tree drivers, and also for the Mesa build. As well as for miinitext.c. But largely gone.
libdummy (dummylib) contains basic utility functions required by libxf86_os.a. There is one symbol per source/object so that each can be overriden individually by whatever uses this library. $XFree86$