[HarfBuzz] harfbuzz: Changes to 'closure-enhancements'

[Behdad Esfahbod]

New branch 'closure-enhancements' available with the following commits:
commit 7cb222b4d09d3e51b9a07995f3bfae437b0951a2
Author: Behdad Esfahbod <behdad at behdad.org>
Date:   Tue Jul 24 09:51:49 2018 -0700

    [closure] Add final flush() just in case

commit e43d3e1eedb93c4d4710920e38b3ef192d385658
Author: Behdad Esfahbod <behdad at behdad.org>
Date:   Tue Jul 24 09:46:57 2018 -0700

    [closure] Remove custom dispatch_recurse_func
    
    This was added to add a should_visit_lookup() check.  However, the recurse
    dispatch will call SubstLookup::closure() which itself has should_visit_lookup()
    check at the top.  So, extra check was not necessary.

commit e9301b50a46115f957a229b10bc294465c07c1b0
Author: Behdad Esfahbod <behdad at behdad.org>
Date:   Tue Jul 24 09:43:27 2018 -0700

    [closure] Separate in and out glyphs
    
    Fixes https://github.com/harfbuzz/harfbuzz/issues/1107