[pango] (8 commits) Non-fast-forward update to branch fix-letterspacing

[Matthias Clasen <matthiasc src gnome org>]

The branch 'fix-letterspacing' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  bbcfecf... Improve letterspacing with marks
  c020014... fixup! Improve letterspacing with marks

Commits added to the branch:

  3396cc2... Fix placement of marks in upright vertical text. (*)
  2214326... context: Cache metrics for the current font (*)
  bff2ada... Merge branch 'cache-context-metrics' into 'master' (*)
  f05be99... Merge branch 'vertical-upright-glyphs' into 'master' (*)
  69a7dde... Add compatibility shim for g_memdup2() (*)
  4c02b0a... Use g_memdup2() (*)
  e2b8620... Merge branch 'memdup2' into 'master' (*)
  fdc432b... Improve letterspacing with marks

(*) This commit already existed in another branch; no separate mail sent