ndctl: release v64.1

Fixes:
    Fix build issues around keyutils inclusion
diff --git a/git-version b/git-version
index 9a03241..5f4f667 100755
--- a/git-version
+++ b/git-version
@@ -19,7 +19,7 @@
 	fi
 }
 
-DEF_VER=64
+DEF_VER=64.1
 
 LF='
 '