* movemail.c:

* movemail.c:
* make-docfile.c: Remove reference to symbols defined by systems
not supported anymore: MAC_OS8, XENIX and STRIDE.

* (src/m/mips.h):
* (src/m/intel386.h):
* callproc.c:
* config.in:
* ecrt0.c:
* emacs.c:
* fileio.c:
* frame.c:
* getpagesize.h:
* keyboard.c:
* lread.c:
* process.c:
* puresize.h:
* sysdep.c:
* systty.h:
* syswait.h:
* unexec.c:
* xdisp.c:
* alloc.c: Remove code containing references to symbols defined by
unsupported systems.