new target to display options

[Roman Neuhauser]

Hi there,

various ports display messages informing the user that they can use
WITH_THIS or WITHOUT_THAT. these messages are put into pre-everything,
pre-fetch, post-fetch... How about a new target, say, "options"?

/usr/ports/foo/bar/Makefile:

options:
    @${ECHO_CMD} "You can use the following variables to build this port:"
    @${ECHO_CMD} "WITH_FOO:    includes support for FOO"
    @${ECHO_CMD} "WITHOUT_BAR: disables support for BAR"


/usr/ports/Mk/bsd.port.mk:

.if !target(options)
options:
    @${ECHO_CMD} "No user-servicable parts inside."
    @${ECHO_CMD} "Warranty void if removed."
.endif

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