patch 8.2.2822: MS-Windows: unnessarily loading libraries when unregistering

Problem:    MS-Windows: unnessarily loading libraries when unregistering OLE.
Solution:   Also skip loading libraries when invoked with "-unregister".  Run
            Vim for README.txt with user privileges.
diff --git a/nsis/README.txt b/nsis/README.txt
index c0a184d..0d01ec8 100644
--- a/nsis/README.txt
+++ b/nsis/README.txt
@@ -66,6 +66,9 @@
 
 Install NSIS if you didn't do that already.
 Also install UPX, if you want a compressed file.
+Download and include the ShellExecAsUser.dll Unicode version which can be
+sourced from: https://nsis.sourceforge.io/ShellExecAsUser_plug-in
+
 
 Unpack the images:
 	cd nsis