sasl: Fixed compilation warning from commit 25264131e2

Added forward declaration of digestdata to overcome the following
compilation warning:

warning: 'struct digestdata' declared inside parameter list

Additionally made the ntlmdata forward declaration dependent on
USE_NTLM similar to how digestdata and kerberosdata are.

diff --git a/lib/curl_sasl.h b/lib/curl_sasl.h
index e9ecab348bc651a6611879e20934b4d9abdeda4b..d5a6ff38cb682ec4caf63c332154b1dd3b222a1c 100644 (file)
--- a/lib/curl_sasl.h
+++ b/lib/curl_sasl.h
@@ -26,7 +26,14 @@
 
 struct SessionHandle;
 struct connectdata;
+
+#if !defined(CURL_DISABLE_CRYPTO_AUTH)
+struct digestdata;
+#endif
+
+#if defined(USE_NTLM)
 struct ntlmdata;
+#endif
 
 #if defined(USE_KRB5)
 struct kerberos5data;