Align existing syscalls

[clemdiep]

This PR doesn't include clone for fork on arm64. This will be included with thread rework.

Note on some changes:

• fcntl was removed as not implemented. This is to catch if there is some calls to it which are required to do somethign when testing
• sysinfo was removed as the implementation differs a lot. Real implementation should set values in a struct about CPU load and memory usage, current implementation prints message about kernel. That syscall wasn't use in usr so I think this is fine.
• The syscalls table mapping number to function was becoming unmaintanable and so commented for now, this will be rework in a futur PR

closes #211