Execute.SChannel not safe init SSLAvailable

[delphicz]

function SSLAvailable: Boolean; is not thread safe, because Initialized is set early and when second thread check SSLAvailable too quick, SSPI is not set, but Initialized is set.

So second thread crash with AV on SSPI.something ( in my case in SSPI.AcquireCredentialsHandle).

Maybe can be solve dirty with
function SSLAvailable: Boolean; var init: function: PSecurityFunctionTable; stdcall; begin Result := Initialized; SSPError := 0; if not Initialized or (SSPI = nil) then {SSPI = nil can be when SSL is inicializing in threads and SSPI is not assigned yet} begin {$IFDEF LOG}WriteLn('SSLAvailable');{$ENDIF} Initialized := True;