Remove CGO dependency from daemon_darwin.go

[priyawadhwa]

This should fix the darwin on linux cross compilation issue.

From the golang docs around os.Executable:

Executable returns the path name for the executable that started the current process. There is no guarantee that the path is still pointing to the correct executable. If a symlink was used to start the process, depending on the operating system, the result might be the symlink or the path it pointed to. If a stable result is needed, path/filepath.EvalSymlinks might help.

Executable returns an absolute path unless an error occurred.

Fixes #31

[priyawadhwa]

closing in favor of #28

[gkristic-vc]

Thanks @priyawadhwa. You are right. I'll follow up in the other PR (that we kind of missed/ignored for a while, it seems 🤫)

[gkristic-vc]

@priyawadhwa In case you didn't notice: the related PR was merged. Thanks once again for taking the time to submit this.

[priyawadhwa]

@gkristic thank you for letting me know!