MSACM: acmDriverAdd[AW] support for ACM_DRIVERADDF_NOTIFYHWND

[Alex Villací­s Lasso]

This patch uses the skeleton provided by the previous patch 
(wine-msacm-08-acmDriverAddW-ACM_DRIVERADDF_NAME.patch) in order to 
provide ACM_DRIVERADDF_NOTIFYHWND support for acmDriverAdd[AW], 
including a fleshing out of MSACM_BroadcastNotification based on a 
separate linked list for notification windows, and derefered 
notifications implemented as a counter instead of a bool flag (as 
suggested by Eric Pouech).

Changelog:
* Add support for case ACM_DRIVERADDF_NOTIFYHWND in acmDriverAdd[AW]
* Broadcast notifications are fleshed out and are now fully functional.

Alex Villacís Lasso

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