We released all the 3.9x development snapshots using:
libgtk-4.0.so.0.xxxx.y
which means that the 4.0.0 release of GTK will have a lower SONAME than
the snapshots. To avoid that, bump the SONAME to 1.xxxx.y.
Fixes: #3392
gtk_binary_age = 100 * gtk_minor_version + gtk_micro_version
-gtk_soversion = '0'
-gtk_library_version = '0.@0@.@1@'.format(gtk_binary_age - gtk_interface_age, gtk_interface_age)
+gtk_soversion = '1'
+gtk_library_version = '1.@0@.@1@'.format(gtk_binary_age - gtk_interface_age, gtk_interface_age)
gtk_api_version = '4.0'