patch 8.0.0285: tests fail with tiny build on Unix

Problem:    Tests fail with tiny build on Unix.
Solution:   Only set g:tester_HOME when build with the +eval feature.
diff --git a/src/version.c b/src/version.c
index 6b0953f..e47b0d3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    285,
+/**/
     284,
 /**/
     283,