Update slowfs_cache third-party module from 1.6 to 1.7.

Do not bump PORTREVISION because this module disabled by default.

<ChangeLog>

2012-02-28    VERSION 1.7
  * Fix on-disk cache size calculation.
    Since the initial release, recorded on-disk cache size was
    decreased twice for purged content (once during cache purge
    and once during subsequent cache update).
    This resulted in recorded on-disk cache size being much
    smaller than in reality, which could lead to on-disk cache
    outgrowing defined "max_size" parameter.
    Patch from Pyry Hakulinen (via ngx_cache_purge, months ago).

  * Append path of the file being cached to the slowfs process
    title.

</ChangeLog>

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