[libxml2] Remove xmltutorial.pdf

[Nick Wellnhofer <nwellnhof src gnome org>]

commit b0e6eb97d99cfe19077aaafc99f4894af46443ef
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Sun Feb 13 22:51:26 2022 +0100

    Remove xmltutorial.pdf
    
    We already have an HTML version.

 doc/Makefile.am              |    1 -
 doc/tutorial/xmltutorial.pdf | 1336 ------------------------------------------
 2 files changed, 1337 deletions(-)
---
diff --git a/doc/Makefile.am b/doc/Makefile.am
index 56cac845..c01dfe83 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -218,7 +218,6 @@ EXTRA_DIST = \
        tutorial/includexpath.c \
        tutorial/index.html \
        tutorial/ix01.html \
-       tutorial/xmltutorial.pdf \
        upgrade.html \
        w3c.png \
        wiki.xsl \