patch 8.0.0701: system test failing when using X11 forwarding

Problem:    System test failing when using X11 forwarding.
Solution:   Set $XAUTHORITY before changing $HOME. (closes #1812)
            Also use a better check for the exit value.
diff --git a/src/version.c b/src/version.c
index 7c1fb10..42fb71d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    701,
+/**/
     700,
 /**/
     699,