jwe: fix the case when we have "zip" in the protected header #174

Job	Run time
osx (gcc)	51s
linux (gcc, fedora:latest, true)	1m 14s
linux (gcc, quay.io/centos/centos:stream9, true)	2m 5s
osx (clang)	49s
linux (gcc, quay.io/centos/centos:stream8, true)	1m 31s
linux (gcc, debian:testing, true)	3m 12s
linux (gcc, debian:latest, true)	3m 33s
linux (gcc, ubuntu:rolling, true)	3m 38s
linux (gcc, ubuntu:jammy, true)	1m 59s
linux (gcc, ubuntu:focal, true)	3m 14s
linux (clang, fedora:latest, true)	1m 6s
linux (clang, quay.io/centos/centos:stream9, true)	2m 11s
linux (clang, quay.io/centos/centos:stream8, true)	2m 18s
linux (clang, debian:testing, true)	3m 34s
linux (clang, debian:latest, true)	3m 16s
linux (clang, ubuntu:rolling, true)	3m 29s
linux (clang, ubuntu:jammy, true)	2m 58s
linux (clang, ubuntu:focal, true)	2m 30s
linux (gcc, quay.io/fedora/fedora:rawhide, false)	56s
linux (clang, quay.io/fedora/fedora:rawhide, false)	50s
linux (gcc, ubuntu:devel, false)	3m 17s
linux (clang, ubuntu:devel, false)	4m 14s
	52m 45s

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