http: lazy allocate cookies array #251

Job	Run time
Build slim tarball	1m 38s
x86_64-linux: with shared libraries	29m 5s
aarch64-linux: with shared libraries	25m 18s
x86_64-darwin: with shared libraries	45m 25s
aarch64-darwin: with shared libraries	25m 56s
	2h 7m 22s

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