Removed to allow CVS to remove the directory.

diff --git a/windows/ttydrv/.cvsignore b/windows/ttydrv/.cvsignore
deleted file mode 100644
index f3c7a7c..0000000
--- a/windows/ttydrv/.cvsignore
+++ /dev/null
@@ -1 +0,0 @@
-Makefile