[libxml2] Add CMake files to EXTRA_DIST

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 5c7bdbc906bc532d866d3a94ae35c2402291ea99
Author: Markus Rickert <rickert fortiss org>
Date:   Wed Nov 25 18:41:14 2020 +0100

    Add CMake files to EXTRA_DIST

 Makefile.am | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/Makefile.am b/Makefile.am
index 0655dfd5..a9284b95 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1260,6 +1260,7 @@ EXTRA_DIST = xml2-config.in xml2Conf.sh.in libxml.spec.in libxml2.spec \
             dbgen.pl dbgenattr.pl regressions.py regressions.xml \
             README.tests Makefile.tests libxml2.syms timsort.h \
             README.zOS \
+            CMakeLists.txt config.h.cmake.in libxml2-config.cmake.cmake.in \
             $(CVS_EXTRA_DIST)