add KRB5_LIB_FUNCTION to all exported functions

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@13863 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/krb5/n-fold.c

@@ -95,7 +95,7 @@ add1(unsigned char *a, unsigned char *b, size_t len)
     }
 }
 
-void
+void KRB5_LIB_FUNCTION
 _krb5_n_fold(const void *str, size_t len, void *key, size_t size)
 {
     /* if len < size we need at most N * len bytes, ie < 2 * size;