Support negative time deltas in BWE #2180

Job	Run time
lint	1m 3s
test_wincrypto (windows-latest, stable)	2m 58s
cargo-deny (aarch64-apple-ios)	18s
test (ubuntu-latest, stable)	1m 21s
test_wincrypto (windows-latest, beta)	2m 11s
cargo-deny (aarch64-linux-android)	19s
test (ubuntu-latest, beta)	1m 38s
test_wincrypto (windows-latest, 1.71.1)	2m 49s
cargo-deny (i686-pc-windows-gnu)	26s
test (ubuntu-latest, 1.71.1)	1m 41s
cargo-deny (i686-pc-windows-msvc)	23s
test (macos-latest, stable)	56s
cargo-deny (i686-unknown-linux-gnu)	20s
test (macos-latest, beta)	1m 4s
cargo-deny (wasm32-unknown-unknown)	19s
test (macos-latest, 1.71.1)	1m 29s
cargo-deny (x86_64-apple-darwin)	22s
test (windows-latest, stable)	2m 34s
cargo-deny (x86_64-apple-ios)	20s
test (windows-latest, beta)	2m 24s
cargo-deny (x86_64-pc-windows-gnu)	20s
test (windows-latest, 1.71.1)	3m 18s
cargo-deny (x86_64-pc-windows-msvc)	22s
cargo-deny (x86_64-unknown-linux-gnu)	19s
cargo-deny (x86_64-unknown-redox)	20s
	29m 34s

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