Problem:    Still checking if memcmp() exists while every system should have
            it now.
Solution:   Remove vim_memcmp().  (James McCoy, closes #1295)

Problem:    Vim does not build on VMS systems.
Solution:   Various changes for VMS. (Zoltan Arpadffy)

Problem:    Still using HAVE_STDARG_H.
Solution:   Assume it's always defined.

Problem:    Various problems on VMS.
Solution:   Fix several VMS problems. (Zoltan Arpadffy)

Problem:    SIZEOF_LONG clashes with similar defines in header files.
Solution:   Rename to a name starting with VIM_.  Also for SIZEOF_INT.