Fix ia64 cross-gcc target.

opensslconf.h is just a dummy, we're lightyears away from working userspace.
ok deraadt@

src/lib/libcrypto/crypto/arch/ia64/opensslconf.h

@@ -0,0 +1,3 @@
+/* $OpenBSD: opensslconf.h,v 1.1 2014/05/27 10:10:59 tobiasu Exp $ */
+
+#error "Dummy header, create a proper ia64 config"