Depend on emulators/wine-gecko instead of emulators/wine-gecko-devel.

Similar to wine-mono/wine-mono-devel, where we made a similar change
with revision 525373, right now both provide the same. However the
latter tracks the evolution of Wine during its development phase, so
this is bound to diverge again.

Also hand over maintainership to salvadore@ (from the vanilla ports@).