Update to INSTALL for docbook-xsl

[Paul Walker <paul@xxxxxxxxxxxxxxxxxxxxx>]

Hi all,

It was only through chance that I found I needed to install the docbook XSL
package in order to build mutt (previously xsltproc had just failed and the
Makefile had just stopped).

I've attached a patch to the INSTALL file to make it clear that this is
needed.

-- 
Paul

--- INSTALL.old 2006-03-24 23:04:08.000000000 +0000
+++ INSTALL     2006-03-24 23:08:04.000000000 +0000
@@ -41,7 +41,11 @@
 
        http://www.gnu.org/software/libiconv/
 
+- For building the manual, mutt needs the DocBook XSL stylesheets.
+  You may find these packaged by your distribution (for example, docbook-xsl
+  for Debian and Ubuntu); if not, try the homepage at:
 
+    http://sourceforge.net/projects/docbook
 
 Installation
 ============

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