[libxml2] Don't distribute libxml2.spec

[Nick Wellnhofer <nwellnhof src gnome org>]

commit aa383e66c742b6bccbf60681268202d0f0bc8ee1
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Fri Aug 26 17:37:09 2022 +0200

    Don't distribute libxml2.spec
    
    This is a generated file.

 Makefile.am | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 4c2ba1f2..e66d70be 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -362,8 +362,7 @@ cleanup:
        -@(find . -name \*.gcda -o -name \*.gcno -exec rm -f {} \;)
        -@(find . -name \*.orig -o -name \*.rej -o -name \*.old -exec rm -f {} \;)
 
-dist-hook: cleanup libxml2.spec
-       -cp libxml2.spec $(distdir)
+dist-hook: cleanup
        (cd $(srcdir) ; tar -cf - --exclude .git win32 os400 vms test result) | (cd $(distdir); tar xf -)
 
 dist-source: distdir