Forward unfaked fcntl calls to real module

[mrbean-bremen]

• had been removed accidentally in 5.7.0
• fixes #1074

While adding support for skipped modules, the forwarding of unfaked attributes to the real fcntl module had been removed accidentally.

Tasks

• [x] Unit tests added that reproduce the issue or prove feature is working
• [x] Fix or feature added
• [x] Entry to release notes added
• [x] Pre-commit CI shows no errors
• [x] Unit tests passing