secur32: get rid of deprecated types

[Austin English]

Fixes: ../../../wine-git/dlls/secur32/schannel_gnutls.c:132:35:
warning: ‘gnutls_certificate_credentials’ is deprecated
[-Wdeprecated-declarations]

was deprecated in upstream commit
a0d2529dbeeb97a8e973a79095912179d9070947 / gnutls_3_0_17-23-ga0d2529

-- 
-Austin
-------------- next part --------------
diff --git a/dlls/secur32/schannel_gnutls.c b/dlls/secur32/schannel_gnutls.c
index 16ce0de..bb481b7 100644
--- a/dlls/secur32/schannel_gnutls.c
+++ b/dlls/secur32/schannel_gnutls.c
@@ -129,7 +129,7 @@ BOOL schan_imp_create_session(schan_imp_session *session, BOOL is_server,
     }
 
     err = pgnutls_credentials_set(*s, GNUTLS_CRD_CERTIFICATE,
-                                  (gnutls_certificate_credentials)cred);
+                                  (gnutls_certificate_credentials_t)cred);
     if (err != GNUTLS_E_SUCCESS)
     {
         pgnutls_perror(err);
@@ -409,7 +409,7 @@ BOOL schan_imp_allocate_certificate_credentials(schan_imp_certificate_credential
 
 void schan_imp_free_certificate_credentials(schan_imp_certificate_credentials c)
 {
-    pgnutls_certificate_free_credentials((gnutls_certificate_credentials)c);
+    pgnutls_certificate_free_credentials((gnutls_certificate_credentials_t)c);
 }
 
 static void schan_gnutls_log(int level, const char *msg)