devel/dbus: use minixmlto over xmlto

Depending on the options set by the user w3m may depend on gtk,
if the X11 option is set)  which will result in a circular dependency
gtk2 -> glib2 -> dbus -> xmlto -> w3m -> gtk2

minixmlto never bring w3m in the dependency list

PR:		263950
Reported by:	dgilbert@eicat.ca

devel/dbus/Makefile

@@ -43,7 +43,8 @@ OPTIONS_DEFAULT=	MANPAGES X11
 OPTIONS_SUB=		yes
 X11_DESC=		Support X11 Desktop Environments
 
-MANPAGES_BUILD_DEPENDS=		xmlto:textproc/xmlto
+MANPAGES_BUILD_DEPENDS=		minixmlto:textproc/minixmlto
+MANPAGES_CONFIGURE_ENV=		XMLTO=${LOCALBASE}/bin/minixmlto
 MANPAGES_CONFIGURE_ENABLE=	xml-docs
 X11_USES=			xorg
 X11_USE=			XORG=ice,sm,x11