Use poll with nfds_t type #907
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Clang 16 makes -Wincompatible-function-pointer-types an error by default, which causes build failure for
(*_poll)function becausenfds_tdoes not need to be equivalent tounsigned int. This commit changes it in all poll function definitions and prototypes tonfds_tas it is defined by POSIX and definesnfds_ttype asunsigned intwhenWITH_POLLis not defined.Fixes: #895
See-also: https://bugs.gentoo.org/881015