fileops.c:1618: warning: weak declaration of `_IO_do_write' after first use results in unspecified behavior

[Roland McGrath]

> I see now these warnings (at a different place!):
> hooks.c:43: warning: weak declaration of `__malloc_initialize_hook' after first use results in unspecified behavior
> hooks.c:45: warning: weak declaration of `__free_hook' after first use results in unspecified behavior
> hooks.c:47: warning: weak declaration of `__malloc_hook' after first use results in unspecified behavior

Oddly enough, that bit in one build and not another for some reason.
With another round of reordering those are gone now too.