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Implement align_label for GTK 3.[14,16).

gtk_misc_set_alignment was deprecated in GTK 3.14. But my replacement
code using gtk_label_set_{x,y}align doesn't work there, because that
function wasn't introduced until GTK 3.16, so there are two minor
versions in the middle where a third strategy is needed.

(That middle strategy doesn't permit arbitrary float alignments, but
that's OK, bceause we only actually use multiples of 0.5.)

--- a/gtk.c

+++ b/gtk.c

@@ -1398,6 +1398,13 @@

 #if GTK_CHECK_VERSION(3,16,0)

     gtk_label_set_xalign(label, x);

     gtk_label_set_yalign(label, y);

+#elif GTK_CHECK_VERSION(3,14,0)

+    gtk_widget_set_halign(GTK_WIDGET(label),

+                          x == 0 ? GTK_ALIGN_START :

+                          x == 1 ? GTK_ALIGN_END : GTK_ALIGN_CENTER);

+    gtk_widget_set_valign(GTK_WIDGET(label),

+                          y == 0 ? GTK_ALIGN_START :

+                          y == 1 ? GTK_ALIGN_END : GTK_ALIGN_CENTER);

 #else

     gtk_misc_set_alignment(GTK_MISC(label), x, y);

 #endif