Mark README files as doc

/etc/rc.d/init.d/README was marked as %config(noreplace), which seems
to be a clear bug. But this primarily affects new README files in
all the .d directories.

split-files.py

@@ -136,6 +136,8 @@ for file in files(buildroot):
             prefix += ' '
     elif file.is_dir() and not file.is_symlink():
         prefix = '%dir '
+    elif 'README' in n:
+        prefix = '%doc '
     elif n.startswith('/etc'):
         prefix = '%config(noreplace) '
     else: