Change to INDEX format

[Roman Neuhauser]

# kris at obsecurity.org / 2004-06-18 19:17:00 -0700:
> This patch extends the format of the INDEX file to separately list
> FETCH_DEPENDS, EXTRACT_DEPENDS and PATCH_DEPENDS instead of lumping
> them all together with BUILD_DEPENDS.

    Do you think this needs to be reflected in the 'search' target in
    bsd.port.subdir.mk?

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