Export QAuthenticatorPrivate for use in QtWebSockets

Change-Id: I0e3e35d2b9d0fdce37ede5781b86741f7604257d
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

src/network/kernel/qauthenticator_p.h

@@ -32,7 +32,7 @@ class QSSPIWindowsHandles;
 class QGssApiHandles;
 #endif
 
-class Q_AUTOTEST_EXPORT QAuthenticatorPrivate
+class Q_NETWORK_EXPORT QAuthenticatorPrivate
 {
 public:
     enum Method { None, Basic, Negotiate, Ntlm, DigestMd5, };