screen-cast: Add screen cast flag to streams

Intended to be used to pass state from screen cast clients down the
line. The first use case will be a boolean whether a screen cast is a
plain recording or not, e.g. letting the Shell decide whether to use a
red dot as the icon, or the generic "sharing" symbol.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1377

src/tests/clutter/conform/meson.build

@@ -1,6 +1,7 @@
 clutter_tests_conform_c_args = [
   '-DG_LOG_DOMAIN="Clutter-Conform"',
   '-DCOGL_DISABLE_DEPRECATION_WARNINGS',
+  '-DGETTEXT_PACKAGE="@0@"'.format(meson.project_name()),
 ]
 clutter_tests_conform_c_args += clutter_debug_c_args
 

src/tests/clutter/interactive/meson.build

@@ -7,6 +7,7 @@ clutter_tests_interactive_c_args = [
   '-DGLIB_DISABLE_DEPRECATION_WARNINGS',
   '-DCOGL_DISABLE_DEPRECATION_WARNINGS',
   '-DCLUTTER_DISABLE_DEPRECATION_WARNINGS',
+  '-DGETTEXT_PACKAGE="@0@"'.format(meson.project_name()),
 ]
 clutter_tests_interactive_c_args += clutter_debug_c_args