patch: support for the OS X keychain

[Eric Knauel]

Here is a small dynamic module that adds support for the OS X keychain
to XEmacs.  

The OS X keychain is a mechanism that stores application passwords
(and other secret information) in encrypted file on the disk.  This is
quite useful: For example, if the user unlocks his keychain on login,
applications may fetch passwords from the keychain to access some
server without having to ask for the server password.

I always wanted Gnus to use the keychain to store my IMAP server
passwords instead of the plain text ~/.netrc or ~/.authinfo files.
So, here is a small patch that adds a module that wraps Carbon API to
keychain into Lisp functions: KEYCHAIN-FIND, KEYCHAIN-REMOVE, and
KEYCHAIN-ADD.  The functions are pretty simple to use.

The call 

(keychain-add "imap:foo at bar.org" "geheim")

adds the password "geheim" to the (user's default) keychain identified
by string "imap:foo at bar.org".  To retrieve this password, simply call:

(keychain-find "imap:foo at bar.org")

-Eric
-- 
"Excuse me --- Di Du Du Duuuuh Di Dii --- Huh Weeeheeee" (Albert King)
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