winex11: Export a function to dock a window into the system tray, and get rid of the WS_EX_TRAYWINDOW style.

rpcrt4: Pass the SPN input to RpcBindingSetAuthInfoA/W into InitializeSecurityContextW instead of AcquireCredentialsHandleA/W.

Don't release the old auth info until we successfully have a new auth 
info and return failure to the caller if RpcAuthInfo_Create fails.

winemenubuilder: Expand environment variable references in the shortcut's WorkDir, Description and IconPath fields.

Move X11DRV_SetWindowRgn to window.c.