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/memmove.c

@@ -44,7 +44,8 @@ RCSID("$Id$");
 #include <sys/types.h>
 #endif
 
-void* memmove(void *s1, const void *s2, size_t n)
+void* ROKEN_LIB_FUNCTION
+memmove(void *s1, const void *s2, size_t n)
 {
   char *s=(char*)s2, *d=(char*)s1;