Implement some parts of proposals posted to tech-pkg:

- Define OS_VERSION in bsd.prefs.mk (...if not already defined).  Previously
  was only set in a conditional block in bsd.pkg.mk.

- Define new values, MACHINE_PLATFORM and MACHINE_GNU_PLATFORM, which
  default to ${OPSYS}-${OS_VERSION}-${MACHINE_ARCH} and
  ${LOWER_OPSYS}-${LOWER_VENDOR}-${LOWER_ARCH} respectively.
  (Probably should nuke LOWER_ARCH and rename LOWER_VENDOR to something
  like MACHINE_GNU_VENDOR.)

- Use ${MACHINE_GNU_PLATFORM} as the argument to `--host' in GNU_CONFIGURE
  packages.

- Allow for ONLY_FOR_PLATFORM and NOT_FOR_PLATFORM, lists of patterns
  in csh(1) glob style which are matched against MACHINE_PLATFORM above
  and take the place of {ONLY,NOT}_FOR_{ARCHS,OPSYS}.  (For now, until
  all pkgs are converted, provide backwards compatibility.)  *Both* may
  be defined, in which case NOT_FOR_PLATFORM takes precedence.

- Also do some significant aesthetic cleanup, based on the idea
  `define platform-specific overrides first, then define a generic case
  with the ?= operator'.  Lots more of this to do yet.

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