bitbake: bitbake-user-manual-customization.xsl: Pointing to mirrors for XSL files.

Instead of pointing to the Sourceforge area, which seems to flake out
every so often, we are now pointing to a mirror to get the XSL files
needed to build the manual.

(Bitbake rev: d9811231b4c8211446bd9275084c26a4718cd175)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/doc/bitbake-user-manual/bitbake-user-manual-customization.xsl

@@ -1,7 +1,15 @@
 <?xml version='1.0'?>
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns="http://www.w3.org/1999/xhtml" xmlns:fo="http://www.w3.org/1999/XSL/Format" version="1.0">
 
-  <xsl:import href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl" />
+  <xsl:import href="http://downloads.yoctoproject.org/mirror/docbook-mirror/docbook-xsl-1.76.1/xhtml/docbook.xsl" />
+
+<!--
+
+  <xsl:import href="../template/1.76.1/docbook-xsl-1.76.1/xhtml/docbook.xsl" />
+
+  <xsl:import href="http://docbook.sourceforge.net/release/xsl/1.76.1/xhtml/docbook.xsl" />
+
+-->
 
   <xsl:include href="../template/permalinks.xsl"/>
   <xsl:include href="../template/section.title.xsl"/>