[imsettings/f16] (8 commits) ...Merge remote-tracking branch 'origin/f17' into f16

[Akira TAGOH]

Summary of changes:

  4c4964c... Add MATE Desktop support. (#866328) (*)
  4bfc59c... remove the unnecessary patch... (*)
  e0b2a04... Fix an error on autoreconf (*)
  2024bbb... fix a build issue (*)
  ecf1a6f... recreate aclocal.m4 (*)
  8db3154... Fix another build issues (*)
  530ed9f... Add gtk-doc to BR (*)
  d813eec... Merge remote-tracking branch 'origin/f17' into f16

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