Update FreeBSD section of npm.md

[rowheel]

Partially addresses #5741

[code-asher]

Thank you! Do we not need libinotify? And how does adding libsecret affect the terminal? If libsecret is missing Code is supposed to fall back to an in-memory keystore I think.

[rowheel]

Thank you! Do we not need libinotify? And how does adding libsecret affect the terminal? If libsecret is missing Code is supposed to fall back to an in-memory keystore I think.

As far as I can recall from our observation, yes libinotify didn't seem to be mandatory requirement, however, missing libsecret was actually causing compile failures.

I'll post a detailed log later. It's been a while since I worked on this issue, so I'll have to restore the FreeBSD VM snapshot, conduct the experiment again and collect any necessary log.

Update: Expect my update no earlier than Jun 10 because my job at company has been rushing hours.