print/hplip: use USE_GNOME=pygobject3 helper

The helper is equivalent to the previous explicit dependency
declaration so no functional or metadata changes.

With hat: gnome

print/hplip/Makefile

@@ -15,11 +15,11 @@ LIB_DEPENDS=	libcupsimage.so:print/cups \
 		libdbus-1.so:devel/dbus
 RUN_DEPENDS=	cups-filters>=0:print/cups-filters \
 		${PYTHON_PKGNAMEPREFIX}dbus>=0:devel/py-dbus@${PY_FLAVOR} \
-		${PYTHON_PKGNAMEPREFIX}distro>=1.0.1:sysutils/py-distro@${PY_FLAVOR} \
-		${PYTHON_PKGNAMEPREFIX}gobject3>=0:devel/py-gobject3@${PY_FLAVOR}
+		${PYTHON_PKGNAMEPREFIX}distro>=1.0.1:sysutils/py-distro@${PY_FLAVOR}
 
-USES=		dos2unix jpeg libtool localbase pkgconfig python \
+USES=		dos2unix gnome jpeg libtool localbase pkgconfig python \
 		shebangfix
+USE_GNOME=	pygobject3:run
 USE_LDCONFIG=	yes
 
 DOS2UNIX_FILES=	fax/filters/cdmfax/jetlib.cpp \