[gtk-doc] mkman: Use full URL to refer to the docbook manpages stylesheet

[Stefan Kost <stefkost src gnome org>]

commit fcc0439081068bb218feeb67c223f89851bde6b8
Author: Emanuele Aina <emanuele aina collabora com>
Date:   Sun May 10 23:11:51 2015 +0200

    mkman: Use full URL to refer to the docbook manpages stylesheet
    
    This fixes the error below when trying to use gtkdoc-mkman:
    
     warning: failed to load external entity "manpages/docbook.xsl"
     cannot parse manpages/docbook.xsl
    
    https://bugzilla.gnome.org/show_bug.cgi?id=749210

 gtkdoc-mkman.in |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtkdoc-mkman.in b/gtkdoc-mkman.in
index 15be1b3..b6e91a5 100644
--- a/gtkdoc-mkman.in
+++ b/gtkdoc-mkman.in
@@ -83,7 +83,8 @@ if $is_xml; then
         --stringparam gtkdoc.version "@VERSION@" \
         --stringparam chunk.quietly $quiet \
         --stringparam chunker.output.quiet $quiet \
-        manpages/docbook.xsl $document || exit $?
+        http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl \
+        $document || exit $?
 else
     for i in `cd sgml;ls *.sgml`; do
         j=`echo $i | sed 's/.sgml/.man/'`