axel: SSL Hostname verification (CVE-2020-13614)

An issue was discovered in ssl.c in Axel before 2.17.8. The TLS implementation lacks hostname verification.

References:

• https://github.com/axel-download-accelerator/axel/releases/tag/v2.17.8
• https://nvd.nist.gov/vuln/detail/CVE-2020-13614

Affected branches:

• master (547f39d6)
• 3.12-stable (547f39d6)
• 3.11-stable
• 3.10-stable
• 3.9-stable