I have enough of these manual hacks in configure scripts that check for
'enchant => someversion' instead of 'enchant-2 >= someversion'. Instead,
let's give them the former.
Caveat: this makes it impossible to have enchant and enchant-2 buildlinked
into the same build, but you do not want that.
This is the newer 2.x release series of enchant. The package does not
conflict with the older 1.x (textproc/enchant). The goal is to move
all reverse-depends to this version, then delete enchant 1.
