Make --enable-snmp cross compile and make libcrypto optional with --without-crypto

Autoconfig work by me, the rest was done by
"Kirill K. Smirnov" <lich@math.spbu.ru>
diff --git a/ospf6d/ospf6_snmp.c b/ospf6d/ospf6_snmp.c
index a1d8d4c..8d9842c 100644
--- a/ospf6d/ospf6_snmp.c
+++ b/ospf6d/ospf6_snmp.c
@@ -25,11 +25,12 @@
 
 #ifdef HAVE_NETSNMP
 #include <net-snmp/net-snmp-config.h>
-#endif /*HAVE_NETSNMP*/
-
+#include <net-snmp/net-snmp-includes.h>
+#else
 #include <asn1.h>
 #include <snmp.h>
 #include <snmp_impl.h>
+#endif
 
 #include "log.h"
 #include "vty.h"