Fix build with meson 0.60

Positional parameters to merge_file() were never allowed and always
ignored, so just drop it.
See: https://github.com/mesonbuild/meson/issues/9441

Fixes #97

data/meson.build

@@ -33,7 +33,6 @@ configure_file(
 policy = act_namespace.to_lower() + '.policy'
 
 i18n.merge_file(
-  policy,
   input: policy + '.in',
   output: policy,
   po_dir: po_dir,

[Tomasz Kłoczko]

Please make neew release because last one fails without that commit.