tests: fix the flaky test test-logtoprocess.t The main change is that we're waiting for the [touched] file to appear for 5 seconds instead of 0.1 seconds. Also, instead of implementing wait-on-file from scratch, we use the existing one from testlib/ that works well.

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fn main() {

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    cc::Build::new()

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        .warnings(true)

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        .file("src/sendfds.c")

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        .file("src/sighandlers.c")

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        .compile("procutil");

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}