www/darkhttpd: Update to 1.16

Changelogs:

• 1.16: https://github.com/emikulic/darkhttpd/releases/tag/v1.16
• 1.15: https://github.com/emikulic/darkhttpd/releases/tag/v1.15

PR: 277386
MFH: 2024Q1
Approved by: tcberner (mentor, implicit)

(cherry picked from commit 564aedad9afb58beb1857d494a60d5e74853b45b)