Add the blowfish encryption patch from Mohsin Ahmed. Needs more work.
diff --git a/src/Make_bc5.mak b/src/Make_bc5.mak
index a1d92bd..1373b4e 100644
--- a/src/Make_bc5.mak
+++ b/src/Make_bc5.mak
@@ -533,6 +533,7 @@
!endif
vimobj = \
+ $(OBJDIR)\blowfish.obj \
$(OBJDIR)\buffer.obj \
$(OBJDIR)\charset.obj \
$(OBJDIR)\diff.obj \
@@ -567,6 +568,7 @@
$(OBJDIR)\regexp.obj \
$(OBJDIR)\screen.obj \
$(OBJDIR)\search.obj \
+ $(OBJDIR)\sha256.obj \
$(OBJDIR)\spell.obj \
$(OBJDIR)\syntax.obj \
$(OBJDIR)\tag.obj \