src: ensure augeas test file is generated before running test

We fail to express an ordering between the custom target that
generates the combined augeas test input file, and the meson
test command.

Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

src/meson.build

@@ -1048,7 +1048,8 @@ if tests_enabled[0]
           '-I', data['builddir'],
           data['file'].full_path(),
         ],
-        suite: 'script'
+        suite: 'script',
+        depends: [data['file']]
       )
     endforeach
   endif