patch 8.1.1048: minor issues with tests

Problem:    Minor issues with tests.
Solution:   Delete unused test OK file.  Add missing entries in list of tests.
            Fix readme file. (Masato Nishihata, closes #4160)
diff --git a/src/version.c b/src/version.c
index cb044bc..d5e8c8b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -776,6 +776,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1048,
+/**/
     1047,
 /**/
     1046,