make test fails behind a proxy #2555

Job	Run time
Build slim tarball	1m 38s
aarch64-linux: with shared libraries	21m 17s
aarch64-darwin: with shared libraries	29m 36s
x86_64-darwin: with shared libraries	46m 5s
x86_64-linux: with shared libraries	27m 18s
	2h 5m 54s

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