Fix openssl3 build

Andreas Hasenackrequested to merge
ahasenack/haproxy:salsa-haproxy-openssl3-ftbfs-fix into master

d/p/fix-ftbfs-openssl3.patch: Cherry-picked from upstream to fix the build against OpenSSL3 (LP: #1945773) (Closes: #1006007)

This is the upstream patch that Ubuntu is carrying.

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