The Rutoken driver installer tries to start this service, and fails if it doesn't exist.
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54396
-- v2: scardsvr: Add stub service. wine.inf: Always use FLG_ADDREG_APPEND for SvcHost entries. setupapi: Create the registry value if it doesn't exist in append_multi_sz_value(). setupapi: Fail installation when trying to append to a registry value of the wrong type. setupapi/tests: Add tests for FLG_ADDREG_APPEND.