support --without-openssl at configure time

Disables and removes dependency on OpenSSL. Many features don't
work and the set of crypto options is greatly restricted. This
will only work on system with native arc4random or /dev/urandom.

Considered highly experimental for now.
diff --git a/ssh-dss.c b/ssh-dss.c
index 9643d90..8ed19d8 100644
--- a/ssh-dss.c
+++ b/ssh-dss.c
@@ -25,6 +25,8 @@
 
 #include "includes.h"
 
+#ifdef WITH_OPENSSL
+
 #include <sys/types.h>
 
 #include <openssl/bn.h>
@@ -217,3 +219,4 @@
 	}
 	return ret;
 }
+#endif /* WITH_OPENSSL */