[GTK] Install libharfbuzz-dev in Tools/gtk/install-dependencies
https://bugs.webkit.org/show_bug.cgi?id=133210

Reviewed by Carlos Garcia Campos.

* gtk/install-dependencies:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@169254 268f45cc-cd09-0410-ab3c-d52691b4dbfc