eclass/tests/git-r3.sh: Partially fix and disable

The tests rely on ext: remote support which apparently no longer works.

Signed-off-by: Michał Górny <mgorny@gentoo.org>

eclass/tests/git-r3.sh

@@ -1,7 +1,12 @@
 #!/bin/bash
-# Copyright 1999-2015 Gentoo Foundation
+# Copyright 1999-2019 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
+# git no longer allows ext: protocol, meh
+exit 0
+
+EAPI=7
+
 source tests-common.sh
 
 inherit git-r3

eclass/tests/tests-common.sh

@@ -103,3 +103,5 @@ PV="0"
 P="${PN}-${PV}"
 PF=${P}
 SLOT=0
+
+addwrite() { :; }