Make `poll()` test work with `gcc` 14 #18658

Job	Run time
Event File	7s
Build Erlang/OTP (64-bit)	6m 58s
Build Erlang/OTP (iOS)	3m 56s
Build Erlang/OTP (Types and Flavors)	7m 42s
Build Erlang/OTP (macOS)	2m 54s
Build Erlang/OTP (Windows)	18m 41s
Build Erlang/OTP (32-bit)	9m 10s
Build Erlang/OTP (cross-compile)	14m 1s
Build and check documentation	5m 9s
Run static analysis	6m 1s
Build Erlang/OTP (clang)	5m 59s
Test Erlang/OTP (emulator)	48m 1s
Test Erlang/OTP (debug)	4m 22s
Release Erlang/OTP	0s
Test Erlang/OTP (system)	7m 41s
	2h 20m 42s

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