Support building with recent DTrace (v1.11 or newer).

Patch from https://bugs.launchpad.net/percona-server/+bug/1196460
Add py-spwd, the spwd module from the Python distribution.

Packaged by Naham Shalman in joyent/pkgsrc#173.
Add py-spwd.
Note addition of devel/py-spwd.
tweak "out of sync" message
Note that EasyPG is built into emacs23 and later.

Therefore, also drop emacs23 as an acceptable version of emacs for this package.
(xemacs versions need review.)
Update "thunderbird" package to version 24.3.0. Changes since 24.2.0:
- MFSA 2014-13 Inconsistent JavaScript handling of access to Window objects
- MFSA 2014-12 NSS ticket handling issues
- MFSA 2014-09 Cross-origin information leak through web workers
- MFSA 2014-08 Use-after-free with imgRequestProxy and image proccessing
- MFSA 2014-04 Incorrect use of discarded images by RasterImage
- MFSA 2014-02 Clone protected content with XBL scopes
- MFSA 2014-01 Miscellaneous memory safety hazards (rv:27.0 / rv:24.3)
- Improved handling of reply-to (bug 933555)
Note update of the "thunderbird" package to version 24.3.0.