devel/gwenhywfar: Update to 5.14.1

Remove libraries for obsolete toolkits unused in the ports tree:
devel/gwenhywfar-gtk2
devel/gwenhywfar-fox16
devel/gwenhywfar-qt5

Technically, FOX 1.6 is still maintained, but no port has used this
support in my almost 16 years of maintainership and allows for some
patching to be dropped.