w32: Do not use the syscall clamps in pollable mode.
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w32: Do not use the syscall clamps in pollable mode.

* src/estream.c (estream_cookie_w32): Add flag no_syscall_clamp.
(func_w32_create): Add arg no_syscall_clamp.
(func_w32_read): Do not call pre/post_syscall_clamp when flag is set.
(func_w32_write): Ditto.
(func_w32_seek): Ditto.
(do_w32open): Set NO_SYSCALL_CLAMP in pollable mode.
(es_create) [W32]: Make sure that pollable-mode is unly used with the
W32 backend.