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read-only in a dumped Emacs.
(mmap_fd_1): New variable.
(mmap_set_vars): Remove local `fd'.  Save mmap_fd in mmap_fd_1,
restore it from there.
(r_alloc, r_re_alloc, r_alloc_free): Call r_alloc_init
unconditionally so that mmap_fd can be initialized there.
(r_alloc_init_fd): Open-coded in r_alloc_init; function removed.
(r_alloc_init) [REL_ALLOC_MMAP && !MAP_ANON]: Open /dev/zero.
(r_alloc_init) [REL_ALLOC_MMAP && MAP_ANON]: Set mmap_fd to -1.