Peter Schellenbach's patch: re-implement the PuTTY cryptographic

functions as calls to the MS Crypto API. Not integrated into the
Makefile yet, but should eventually allow building of an SSH-enabled
PuTTY which contains no native crypto code, so it can be used
everywhere (and anyone who can get the MS encryption pack can still
use the SSH parts).

[originally from svn r425]

window.c

@@ -474,8 +474,12 @@ int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show) {
 	DeleteObject(pal);
     WSACleanup();
 
-    if (cfg.protocol == PROT_SSH)
+    if (cfg.protocol == PROT_SSH) {
 	random_save_seed();
+#ifdef MSCRYPTOAPI
+	crypto_wrapup();
+#endif
+    }
 
     return msg.wParam;
 }