define ROKEN_LIB_FUNCTION on all exported functions

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@14773 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/roken/estrdup.c

@@ -45,7 +45,7 @@ RCSID("$Id$");
  * Like strdup but never fails.
  */
 
-char *
+char * ROKEN_LIB_FUNCTION
 estrdup (const char *str)
 {
     char *tmp = strdup (str);