Add the blowfish encryption patch from Mohsin Ahmed. Needs more work.
diff --git a/src/Make_ivc.mak b/src/Make_ivc.mak
index 2d118d5..1b06aff 100644
--- a/src/Make_ivc.mak
+++ b/src/Make_ivc.mak
@@ -210,6 +210,7 @@
LINK32_OBJS= \
$(EXTRAS) \
+ "$(INTDIR)/blowfish.obj" \
"$(INTDIR)/buffer.obj" \
"$(INTDIR)/charset.obj" \
"$(INTDIR)/diff.obj" \
@@ -246,6 +247,7 @@
"$(INTDIR)/regexp.obj" \
"$(INTDIR)/screen.obj" \
"$(INTDIR)/search.obj" \
+ "$(INTDIR)/sha256.obj" \
"$(INTDIR)/spell.obj" \
"$(INTDIR)/syntax.obj" \
"$(INTDIR)/tag.obj" \