http,https: fix double ERR_PROXY_TUNNEL emission #846

Job	Run time
Build slim tarball	1m 46s
aarch64-linux: with shared libraries	29m 54s
x86_64-linux: with shared libraries	35m 41s
aarch64-darwin: with shared libraries	35m 18s
x86_64-darwin: with shared libraries	59m 59s
	2h 42m 38s

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