[PATCH] widl: Allow optional interface parameter on the [activatable] attribute.

[Marvin]

Hi,

While running your changed tests, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=105615

Your paranoid android.


=== debian11 (build log) ===

../wine/tools/widl/parser.y:587.49-3393.0: error: missing ‘}’ at end of file
Task: The win32 Wine build failed

=== debian11 (build log) ===

../wine/tools/widl/parser.y:587.49-3393.0: error: missing ‘}’ at end of file
Task: The wow64 Wine build failed