[xmlsec] Big patch to xmlsec in recent OpenOffice.org sources

[Aleksey Sanin]

> 4) src/nss/ciphers.c
> 6) src/nss/keywrappers.c
> 9) src/nss/symkeys.c

Unfortunately, I found quite  a lot of problems with these changes:
   - hmac does not work at all (I guess, the reason is symkeys.c changes)
   - aes key wrap does not at all
   - many des encryption regression tests do not work

I would be glad to work with you on resolving these issues but I can not
accept these changes right now.

Aleksey