Log Message:
Update pango to 1.36.8

Apparently the ellipsis attributes are enough for gtk3 to need this
version.

Overview of changes between 1.36.7 and 1.36.8
=============================================
- Make tests not fail on build.gnome.org

Overview of changes between 1.36.6 and 1.36.7
=============================================
- Add tests for pango markup
- Add tests for PangoLayout
- Add an analysis flag for ellipsis (#735719)
- Treat attributes in ellipsis better (#735732)