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Use malloc on non-Windows platforms #1350

Job	Run time
check (macos-latest, stable, x86_64-pc-windows-gnu)	1m 7s
check (macos-latest, stable, aarch64-pc-windows-gnullvm)	15s
check (macos-latest, stable, x86_64-pc-windows-gnullvm)	16s
check (macos-latest, stable, i686-pc-windows-gnullvm)	17s
check (macos-latest, nightly, x86_64-pc-windows-gnu)	57s
check (macos-latest, nightly, aarch64-pc-windows-gnullvm)	15s
check (macos-latest, nightly, x86_64-pc-windows-gnullvm)	17s
check (macos-latest, nightly, i686-pc-windows-gnullvm)	17s
check (ubuntu-latest, stable, x86_64-pc-windows-gnu)	1m 4s
check (ubuntu-latest, stable, aarch64-pc-windows-gnullvm)	11s
check (ubuntu-latest, stable, x86_64-pc-windows-gnullvm)	9s
check (ubuntu-latest, stable, i686-pc-windows-gnullvm)	11s
check (ubuntu-latest, nightly, x86_64-pc-windows-gnu)	49s
check (ubuntu-latest, nightly, aarch64-pc-windows-gnullvm)	1m 1s
check (ubuntu-latest, nightly, x86_64-pc-windows-gnullvm)	53s
check (ubuntu-latest, nightly, i686-pc-windows-gnullvm)	54s
	8m 53s

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