Commit06558f4

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Backport IPC::Run optimization to src/test/perl.

This one-liner makes the TAP portion of "make check-world" 7% faster ona non-Windows machine.Discussion:https://postgr.es/m/20240331050310.09@rfd.leadboat.com

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`@@ -189,6 +189,11 @@ Set to true when running under MSYS2.`
`189`	`189`
`190`	`190`	`INIT`
`191`	`191`	`{`
	`192`	`+# See https://github.com/cpan-authors/IPC-Run/commit/fc9288c for how this`
	`193`	`+# reduces idle time. Remove this when IPC::Run 20231003.0 is too old to`
	`194`	`+# matter (when all versions that matter provide the optimization).`
	`195`	`+$SIG{CHLD} =sub { }`
	`196`	`+unlessdefined$SIG{CHLD};`
`192`	`197`
`193`	`198`	`# Return EPIPE instead of killing the process with SIGPIPE. An affected`
`194`	`199`	`# test may still fail, but it's more likely to report useful facts.`

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