Add the blowfish encryption patch from Mohsin Ahmed.  Needs more work.
diff --git a/src/proto/sha256.pro b/src/proto/sha256.pro
new file mode 100644
index 0000000..635721c
--- /dev/null
+++ b/src/proto/sha256.pro
@@ -0,0 +1,5 @@
+/* sha256.c */
+char *sha256_key __ARGS((char *buf));
+int sha256_self_test __ARGS((void));
+void sha2_seed __ARGS((char_u header[], int header_len));
+/* vim: set ft=c : */