[libxml2] Remove old devhelp format

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 00e618eb0a8a924ee4ba06e3647673310dc856b5
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Mon Jan 17 21:39:27 2022 +0100

    Remove old devhelp format
    
    See #295.

 doc/devhelp/Makefile.am     |   10 +-
 doc/devhelp/devhelp.xsl     |  127 --
 doc/devhelp/libxml2.devhelp | 3580 -------------------------------------------
 3 files changed, 2 insertions(+), 3715 deletions(-)
---
diff --git a/doc/devhelp/Makefile.am b/doc/devhelp/Makefile.am
index fc4e8209..3850fd32 100644
--- a/doc/devhelp/Makefile.am
+++ b/doc/devhelp/Makefile.am
@@ -2,7 +2,6 @@ devhelpdir = $(datadir)/gtk-doc/html/libxml2
 
 dist_devhelp_DATA =                    \
        libxml2.devhelp2                \
-       libxml2.devhelp                 \
        $(HTML_FILES)                   \
        $(EXTRA_FORMAT)
 
@@ -67,17 +66,12 @@ EXTRA_FORMAT=                               \
        up.png                          \
        style.css
 
-EXTRA_DIST = devhelp.xsl html.xsl
+EXTRA_DIST = devhelp2.xsl html.xsl
 
 if REBUILD_DOCS
-rebuild: libxml2.devhelp2 libxml2.devhelp $(HTML_FILES)
+rebuild: libxml2.devhelp2 $(HTML_FILES)
 .PHONY: rebuild
 
-libxml2.devhelp $(HTML_FILES): devhelp.xsl html.xsl $(top_srcdir)/doc/libxml2-api.xml
-       -@(if [ -x $(XSLTPROC) ] ; then \
-         echo Rebuilding devhelp files ; \
-         $(XSLTPROC) --nonet -o $(srcdir)/libxml2.devhelp $(srcdir)/devhelp.xsl 
$(top_srcdir)/doc/libxml2-api.xml ; fi );
-
 libxml2.devhelp2 $(HTML_FILES): devhelp2.xsl html.xsl $(top_srcdir)/doc/libxml2-api.xml
        -@(if [ -x $(XSLTPROC) ] ; then \
          echo Rebuilding devhelp2 files ; \