Default location for docbook stylesheets in Gentoo - Mailing list pgsql-patches

This patch adds the default location for the DocBook DSSSL stylesheets
in gentoo's package system to the configure script.

The package in question is app-text/docbook-dsssl-stylesheets.

I'll understand if we don't want to include the location for every
single distribution under the sun, but figured it's more help than
harm to include it.

Cheers
BJ