Log Message:
GTK2 no longer depends on libpangox as of GTK2 version 2.8.x.
However, wxGTK24 still depends on libpangox.
Copy PANGOX test from unicode section of configure script.
This causes libpangox to show up as a dependency in pkg-config.
This fixes build problems with programs depending on wxGTK24.
This addresses PR#31536.