Doh; forgot to add the OPAL_DECLSPEC to munmap().

This commit was SVN r20923.

opal/mca/memory/ptmalloc2/opal_ptmalloc2_munmap.c

@@ -47,7 +47,7 @@ int  __munmap(void* addr, size_t len);
 
 
 /* intercept munmap, as the user can give back memory that way as well. */
-int 
+OPAL_DECLSPEC int 
 munmap(void* addr, size_t len)
 {
     return opal_mem_free_ptmalloc2_munmap(addr, len, 0);