[PATCH 1/3] add bb_getgrouplist_malloc to libbb

[Tito]

Hi,
this patch adds the bb_getgrouplist_malloc funtion to libb:

llist_t* FAST_FUNC bb_getgrouplist_malloc(uid_t ruid, gid_t rgid, gid_t *egid)

 The functon returns a malloced linked list of the user's gids that you will have to free
  yourself, or NULL on failure. If gid_t *egid is not NULL and *egid != rgid *egid is added
 at the second place of the list. 

 The advantages of this function are:
 1) the list is easy to walk (without the need of group number counters)
 2) used memory is easy to free  (without the  need of saved pointers to the beginning of the allocated memory).
 3) the function uses getgrouplist if available or getgrent.
 4) it can handle egid != rgid if needed
 
 llist_t* FAST_FUNC bb_getgrouplist_malloc(uid_t ruid, gid_t rgid, gid_t *egid)

Please apply if you like it.

Hints and critics are welcome.

Ciao,
Tito
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