r20420 - gnucash/trunk - Make error message on missing <dbi/dbi.h> more verbose.

[Christian Stimming]

Author: cstim
Date: 2011-03-14 01:39:49 -0400 (Mon, 14 Mar 2011)
New Revision: 20420
Trac: http://svn.gnucash.org/trac/changeset/20420

Modified:
   gnucash/trunk/configure.ac
Log:
Make error message on missing <dbi/dbi.h> more verbose.

Also mention the infamous dbi database drivers here,
https://lists.gnucash.org/pipermail/gnucash-devel/2011-February/031171.html