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/net_write.c

@@ -46,7 +46,7 @@ RCSID("$Id$");
  * Like write but never return partial data.
  */
 
-ssize_t
+ssize_t ROKEN_LIB_FUNCTION
 net_write (int fd, const void *buf, size_t nbytes)
 {
     const char *cbuf = (const char *)buf;