Log Message:
Update fam to 2.7.0.  Fixes the following PR's:

  - PR pkg/23017
  - PR pkg/23495
  - PR pkg/23496
  - PR pkg/24578

The patches for 23017 and 24578 were provided by reed@.  Although rh@
suspended PR 23017 saying that pkgsrc does not support installation to
/usr, this still needs to be fixed because the same problem occurs
even when LOCALBASE != /usr.

Changes since 2.6.10:
    Changed NOGROUP usage in src/Cred.c++ to -1 as NOGROUP is not defined
    in IRIX.
    (mraymond@sgi.com)
    removed const modifier from Scheduler.h to fix GCC 3.x build.
    (wardle@sgi.com)
    created new GNU autotools files:
    - test whether we have IMon rather than testing OS.
    - test whether we have sockaddr length members rather than testing OS.
    - install daemon in sbin rather than bin.
    - install manual pages in typical GNU/Linux sections.
    - rename daemon to famd.
    - rename fam source directory to src.
    - rename libfam source directory to lib.
    - remove editconf and util subdirectory.
    - remove rpm target and build subdirectory.
    - remove support target and subdirectory.
    [wardle@sgi.com] (wardle@sgi.com)
    fixed warnings about typenames in BTree.h.
    (wardle@sgi.com)