This reverts commit aabc356b80. Labels are back to looking at x/yalign (for now).
aabc356b80
Now that labels and images no longer use x/yalign in their code, we need to make gtk_misc_set_alignment set the h/valign for these widgets, to keep it stumbling along until its final demise. https://bugzilla.gnome.org/show_bug.cgi?id=730613
This has been dangling ever since 3.0.