uninit function can call close again, which will try to obtain a held
lock. Unlock the lock before calling the actual close function, since
we already disassociated cm from the rest of the data structures.
This change makes the code symmetrical and ensures the lock not to be
aquired recursively.
The problem that the lock is tried to be aquired recursively was
pointed out by Matthias Drochner.
add core engine of Citrus iconv and some support routines.
- iconv core (citrus_iconv)
- coded character set mapper (csmapper)
- encoding scheme database (esdb)
- standard encoding scheme handler (stdenc)
- basic character set manipulation utilities (bcs)
- mmap based infrastructure (citrus_lookup/_mmap/_memstream/_db)
- some source codes of new plugins (not built yet)
