build: Fix build when openssl/engine.h is not available anymore #174

Job	Run time
build	5m 1s
job (debian:stable, gcc, i386, tpm2-tss, i386, openssl-3.0.5)	3m 3s
job (debian:stable, ppc64el, powerpc64le-linux-gnu-gcc, ibmtss, cross-compile)	47s
job (debian:stable, arm64, aarch64-linux-gnu-gcc, tpm2-tss, cross-compile)	48s
job (debian:stable, s390x, s390x-linux-gnu-gcc, ibmtss, cross-compile)	45s
job (alpine:latest, gcc, tpm2-tss)	25s
job (opensuse/tumbleweed, clang, ibmtss)	2m 14s
job (opensuse/leap, gcc, tpm2-tss)	1m 8s
job (ubuntu:noble, gcc, ibmtss)	45s
job (ubuntu:jammy, gcc, ibmtss)	40s
job (ubuntu:xenial, clang, tpm2-tss)	49s
job (fedora:latest, clang, ibmtss)	1m 28s
job (fedora:latest, clang, ibmtss, um, ../linux, 1)	3m 6s
job (quay.io/centos/centos:stream9, clang, tpm2-tss)	2m 5s
job (debian:testing, clang, tpm2-tss)	47s
job (debian:stable, clang, ibmtss)	47s
job (alt:sisyphus, gcc, libtpm2-tss-devel)	58s
	25m 36s

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