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

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• 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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Conan v1 pipeline ✔️

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All green in build 5 (b4b97343df9b1231a5f42a4ddee63e189f0690df):

• libcurl/8.8.0:
  Built 20 packages out of 22 (All logs)

• libcurl/8.9.1:
  Built 20 packages out of 22 (All logs)

• libcurl/8.4.0:
  Built 20 packages out of 22 (All logs)

• libcurl/8.10.0:
  Built 20 packages out of 22 (All logs)

• libcurl/8.10.1:
  Built 20 packages out of 22 (All logs)

• libcurl/8.0.1:
  Built 20 packages out of 22 (All logs)

• libcurl/8.6.0:
  Built 20 packages out of 22 (All logs)

• libcurl/8.2.1:
  Built 20 packages out of 22 (All logs)

• libcurl/8.5.0:
  Built 20 packages out of 22 (All logs)

• libcurl/7.88.1:
  Built 20 packages out of 22 (All logs)

• libcurl/8.1.2:
  Built 20 packages out of 22 (All logs)

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All green in build 4 (b4b97343df9b1231a5f42a4ddee63e189f0690df):

• libcurl/8.10.1:
  All packages built successfully! (All logs)

• libcurl/8.0.1:
  All packages built successfully! (All logs)

• libcurl/8.10.0:
  All packages built successfully! (All logs)

• libcurl/8.6.0:
  All packages built successfully! (All logs)

• libcurl/8.2.1:
  All packages built successfully! (All logs)

• libcurl/8.9.1:
  All packages built successfully! (All logs)

• libcurl/8.8.0:
  All packages built successfully! (All logs)

• libcurl/8.4.0:
  All packages built successfully! (All logs)

• libcurl/8.1.2:
  All packages built successfully! (All logs)

• libcurl/8.5.0:
  All packages built successfully! (All logs)

• libcurl/7.88.1:
  All packages built successfully! (All logs)