deskutils/py-spice-gtk: remove port

spice-gtk dropped support of the old style Python bindings (non-gir based)
quite some time ago [1]. So keeping this port no longer makes sense as
it's not different from the master port.

1: 0917002c48

MOVED

@@ -9860,3 +9860,4 @@ audio/ruby-xmms2||2018-01-15|Has expired: Does not build with current versions o
 net/unison-nox11|net/unison@nox11|2018-01-15|Moved to a flavored, generic, version
 audio/hydrogen-devel|audio/hydrogen|2018-01-17|Out of date: use audio/hydrogen for now
 graphics/py-rabbyt||2018-01-19|Has expired: Development ceased, no longer used in the ports
+deskutils/py-spice-gtk|deskutils/spice-gtk|2018-01-20|Old style Python bindings dropped, no difference from the master port

deskutils/Makefile

@@ -202,7 +202,6 @@
     SUBDIR += py-pycarddav
     SUBDIR += py-pystash
     SUBDIR += py-send2trash
-    SUBDIR += py-spice-gtk
     SUBDIR += py-taskw
     SUBDIR += py-vdirsyncer
     SUBDIR += py-vobject

deskutils/py-spice-gtk/Makefile

@@ -1,11 +0,0 @@
-# Created by: olevole@olevole.ru
-# $FreeBSD$
-
-PORTREVISION=	1
-COMMENT=	Python bindings for SPICE remote desktop servers
-MASTERDIR=	${.CURDIR}/../spice-gtk
-
-CONFLICTS=	spice-gtk-[0-9]*
-SPICE_SLAVE=	yes
-
-.include "${MASTERDIR}/Makefile"