Use stb's paeth predictor #623

Job	Run time
powerpc_cross	13s
rustfmt	11s
feature_check	58s
build (1.57.0, ubuntu-latest)	49s
feature_check (benchmarks)	58s
test_all	3m 9s
build (1.57.0, windows-latest)	2m 0s
build (1.57.0, macos-latest)	59s
build (stable, ubuntu-latest)	13s
build (stable, windows-latest)	40s
build (stable, macos-latest)	16s
build (beta, ubuntu-latest)	15s
build (beta, windows-latest)	27s
build (beta, macos-latest)	18s
build (nightly, ubuntu-latest)	13s
build (nightly, windows-latest)	38s
build (nightly, macos-latest)	19s
	12m 36s

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