gtls: add gnutls include for the session type

Follow-up to 8fbd6feddfa5 to make it build more universally

diff --git a/lib/vtls/gtls.h b/lib/vtls/gtls.h
index 226d3aebbe2b8804df43619c5ae41dcbe93d467b..642d5f093a1ce471dff920a69632628491d26c28 100644 (file)
--- a/lib/vtls/gtls.h
+++ b/lib/vtls/gtls.h
@@ -27,7 +27,7 @@
 #ifdef USE_GNUTLS
 
 #include "urldata.h"
-
+#include <gnutls/gnutls.h>
 CURLcode
 Curl_gtls_verifyserver(struct Curl_easy *data, struct connectdata *conn,
                        gnutls_session_t session,