Description:
------------
Contrary to the documentation which states that dbase_pack() returns
TRUE on success and FALSE on failure, it always returns TRUE.
Furthermore, the warning message is confusing at best.


Test script:
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<?php

$filename = 'test.dbf';

$db = dbase_create($filename, [['NAME', 'C', 50]]);
dbase_add_record($db, ['foo']);
dbase_add_record($db, ['bar']);
dbase_delete_record($db, 1);
dbase_close($db);

$db = dbase_open($filename, 0); // read-only
var_dump(dbase_pack($db));
dbase_close($db);


Expected result:
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Warning: dbase_pack(): couldn't write to the file in %s on line %d
bool(false)

Actual result:
--------------
Warning: dbase_pack(): dbase_pack() couldn't truncate the file to the right size. Some deleted records may still be left in there in %s on line %d
bool(true)