patch applied (cabal): Validate the docbook xml before processing.

Fri Feb 13 05:41:36 PST 2009 Duncan Coutts * Validate the docbook xml before processing. Apparently xsltproc does not validate against the dtd. This should stop errors creaping back in. M ./Makefile -1 +6 View patch online: http://darcs.haskell.org/cabal/_darcs/patches/20090213134136-adfee-90fdd69fa...