x11/gnome3 port options

[Don Lewis]

This snippet of the gnome3 Makefile looks wrong:

.if ${.CURDIR:T}!="gnome3-lite"
OPTIONS_DEFINE+=MAPI
MAPI_DESC=      Depend on evolution-mapi (pulls in samba4)
                
DOCS_RUN_DEPENDS=       gnome-user-docs>=0:${PORTSDIR}/misc/gnome-user-docs
MAPS_RUN_DEPENDS=       evolution-mapi>=3.0.0:${PORTSDIR}/mail/evolution-mapi
.endif


The first problem is that we never add DOCS to OPTIONS_DEFINE.  The
second problem is that MAPS_RUN_DEPENDS looks like it should be
MAPI_RUN_DEPENDS.