libcurl: support libressl

[x93008]

Summary

Changes to recipe: libcurl/**

Motivation

see issues/14619. Some projects require the use of libressl

Details

Added with_ssl=“libressl” option, and did some compatibility work for this option

---

• Read the contributing guidelines
• Checked that this PR is not a duplicate: list of PRs by recipe
• Tested locally with at least one configuration using a recent version of Conan

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