Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/runtime/doc/os_mint.txt b/runtime/doc/os_mint.txt
index 06984b4..96e139d 100644
--- a/runtime/doc/os_mint.txt
+++ b/runtime/doc/os_mint.txt
@@ -1,4 +1,4 @@
-*os_mint.txt*   For Vim version 8.0.  Last change: 2005 Mar 29
+*os_mint.txt*   For Vim version 8.1.  Last change: 2005 Mar 29
 
 
 		  VIM REFERENCE MANUAL    by Jens M. Felderhoff