Use stb's paeth predictor #622

Job	Run time
powerpc_cross	11s
rustfmt	19s
feature_check	1m 0s
build (1.57.0, ubuntu-latest)	53s
feature_check (benchmarks)	1m 1s
build (1.57.0, windows-latest)	1m 7s
test_all	3m 15s
build (1.57.0, macos-latest)	55s
build (stable, ubuntu-latest)	13s
build (stable, windows-latest)	54s
build (stable, macos-latest)	17s
build (beta, ubuntu-latest)	16s
build (beta, windows-latest)	27s
build (beta, macos-latest)	20s
build (nightly, ubuntu-latest)	21s
build (nightly, windows-latest)	40s
build (nightly, macos-latest)	18s
	12m 27s

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