hdb: Lower-case HDB_DB_FORMAT to make it valid ASN.1

In order to resolve some shift/reduce conflicts in the ASn.1 compiler's
grammar we need to be strict about value names starting with lower case
and type names starting with upper-case.

lib/hdb/hdb.asn1

@@ -4,7 +4,7 @@ BEGIN
 
 IMPORTS EncryptionKey, KerberosTime, Principal FROM krb5;
 
-HDB_DB_FORMAT INTEGER ::= 2	-- format of database, 
+hdb_db_format INTEGER ::= 2	-- format of database, 
 				-- update when making changes
 
 -- these must have the same value as the pa-* counterparts

lib/hdb/hdb.h

@@ -46,6 +46,8 @@
 #include <heim_asn1.h>
 #include <hdb_asn1.h>
 
+#define HDB_DB_FORMAT hdb_db_format
+
 typedef HDB_keyset hdb_keyset;
 typedef HDB_entry hdb_entry;
 typedef HDB_entry_alias hdb_entry_alias;