Fix error with cffi version 1.16 and newer

mroethke · mroethke · commit 7c9a673e8464 · 2024-06-04T12:46:11.000+02:00
cffi seems to have started verifying that the cdef and the c compiler
agree on struct sizes. The sizes for the tr_{tcp,ssh}_config structs did
not match anymore with current rtrlib versions.

Fix this by making the size variable in the cdef so cffi asks the c
compiler about the size.
diff --git a/rtrlib.cdef b/rtrlib.cdef
@@ -118,6 +118,7 @@ struct tr_tcp_config {
     char *host;
     char *port;
     char *bindaddr;
+    ...;
 };
 
 /**
@@ -758,4 +759,5 @@ struct tr_ssh_config {
     char *username;
     char *server_hostkey_path;
     char *client_privkey_path;
+    ...;
 };
