* make-dist: Remove references to files in mac/ that have been

* make-dist: Remove references to files in mac/ that have been
deleted.

* README:
* INSTALL: Only mention MacOSX.

* cw6-mcp.xml:
* make-package:
* makefile.MPW:
* inc/alloca.h:
* inc/config.h:
* inc/defs-cw6.h:
* inc/dirent.h:
* inc/epaths.h:
* inc/grp.h:
* inc/m-mac.h:
* inc/pwd.h:
* inc/s-mac.h:
* inc/termio.h:
* inc/utime.h:
* inc/utsname.h:
* inc/sys/file.h:
* inc/sys/ioctl.h:
* inc/sys/param.h:
* inc/sys/stat.h:
* inc/sys/time.h:
* inc/sys/types.h:
* src/EmacsMPW.r: Remove files for no longer supported pre-MacOSX
systems.