Log Message:
Update rubber to 1.1

Remove patch-ab, as it has been applied upstream (no dependency over gmake)

Version 1.1 (2006-03-17)
* Features
- Support for user-defined conversion rules.
- Support for xindy and sam2p.
- Improved fig2dev support.
- Experimental cache system.
* Bugfixes
- Better parsing of log files.
- Improved error reporting (including for BibTeX and Metapost).
- Better handling of verbatim environments.
- Many other fixes.