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revbump for textproc/icu

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Recursive revbump associated with update of lang/ocaml

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net/unison2.51: set MAKE_JOB_SAFE=no
this fails to build for me with MAKE_JOBS=8 otherwise

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*: Recursive revbump from textproc/icu-68.1

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net/unison: Update to 2.51.3

Upstream NEWS content

## 2.51.3
  * ocaml support is now from 4.05 to 4.11
  * reduction of stack usage by proper tail recursion
  * MS Windows build improvements
  * Some nontrivial changes to profile parsing (G.raud Meyer)
    ’=’ has been considered whitespace until now: several
    following chars are considered as only one; trailing chars are
    discarded; any non emty sequence of char is splitting. This is
    non standard and leads to confusion, for example -ignore==
    ’Name .*=*’ is valid when -ignore=’Name .*=*’ is not, and
    worse -ignore=’Name *=’ is the same as -ignore=’Name *’. The
    parser now takes just a single ’=’ as delimiter after the
    option name. Other = characters are considered as part of the
    value being assigned to the option.
  * Numerous improvements to the text user-interface (G.raud Meyer)
    New key-commands that restrict the display to a set of
    "matching" items: ones that are offering to propagate changes
    in a particular direction, conflicts, files to be merged,
    etc., plus several more useful key-commands. Type "?" to
    Unison to see all available commands.

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unison2.51: fix OCAML_USE_OPT_COMPILER check

The value is yes or no, not true.

Bump PKGREVISION since binary packages might change.

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*: revbump after fontconfig bl3 changes (libuuid removal)

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Revbump for icu

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unison2.51: remove direct inclusion of gtk2, brought in by ocaml-lablgtk now

Log message:
Recursive revision bump after textproc/icu update