[PATCH v2] uiautomationcore: Add stub UiaRegisterProviderCallback function

[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=84107

Your paranoid android.


=== debiant (build log) ===

../wine/include/uiautomationcoreapi.h:62:59: error: unknown type name ‘ProviderType’
../wine/include/uiautomationcoreapi.h:63:41: error: unknown type name ‘UiaProviderCallback’
../wine/dlls/uiautomationcore/uia_main.c:97:41: error: unknown type name ‘UiaProviderCallback’
../wine/include/uiautomationcoreapi.h:62:59: error: unknown type name ‘ProviderType’
../wine/include/uiautomationcoreapi.h:63:41: error: unknown type name ‘UiaProviderCallback’
Task: The win32 Wine build failed

=== debiant (build log) ===

../wine/include/uiautomationcoreapi.h:62:59: error: unknown type name ‘ProviderType’
../wine/include/uiautomationcoreapi.h:63:41: error: unknown type name ‘UiaProviderCallback’
../wine/dlls/uiautomationcore/uia_main.c:97:41: error: unknown type name ‘UiaProviderCallback’
../wine/include/uiautomationcoreapi.h:62:59: error: unknown type name ‘ProviderType’
../wine/include/uiautomationcoreapi.h:63:41: error: unknown type name ‘UiaProviderCallback’
Task: The wow64 Wine build failed