MSACM: acmDriverAddW skeleton, implementation of ACM_DRIVERADDF_NAME.
- Rework acmDriverAddA to call acmDriverAddW.
- Implement stub for acmDriverAddW with switch for the 3 known cases
  of driver add.
- Implementation for case ACM_DRIVERADDF_NAME, which loads driver name
  & alias from registry (similar to msacm32 load).
diff --git a/dlls/msacm/wineacm.h b/dlls/msacm/wineacm.h
index 0a3af41..e9b9247 100644
--- a/dlls/msacm/wineacm.h
+++ b/dlls/msacm/wineacm.h
@@ -354,6 +354,8 @@
 extern void MSACM_DisableNotifications(void);
 extern void MSACM_EnableNotifications(void);
 
+extern PWINE_ACMDRIVERID MSACM_RegisterDriverFromRegistry(LPCWSTR pszRegEntry);
+
 /* From msacm32.c */
 extern HINSTANCE MSACM_hInstance32;