tests

examples: fix multithreaded example callconv #396

Job	Run time
test_zig_nightly (windows-latest)	27s
test_cross (macos-latest)	32s
test_zig_nightly (macos-latest)	27s
test_cross (ubuntu-24.04-arm)	29s
test_zig_nightly (ubuntu-24.04-arm)	23s
test_cross (windows-latest)	33s
test_zig_015 (macos-latest)	1m 36s
test_zig_015 (ubuntu-24.04-arm)	2m 12s
test_zig_015 (windows-latest)	3m 55s
test_zig_nightly (ubuntu-latest)	23s
test_cross (ubuntu-latest)	27s
test_zig_015 (ubuntu-latest)	1m 38s
	13m 2s

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