Readline multiline completer #1534

Job	Run time
Build slim tarball	1m 32s
aarch64-darwin: with shared libraries	2h 22m 2s
x86_64-darwin: with shared libraries	4h 37m 58s
x86_64-linux: with shared libraries	2h 31m 0s
aarch64-linux: with shared libraries	2h 27m 16s
	11h 59m 48s

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