configure: drop duplicate feature checks for poll()
, if_nametoindex()
#15170
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Before this patch they were detected via manual methods, then with
AC_CHECK_FUNCS()
.Delete the manual checks and keep the latter.
Also delete
CURL_INCLUDES_POLL()
which is no longer used afterthe above.
Let me know if there is/was a reason for the duplicate checks, or if
it'd be better to keep the manual checks instead.