Add fuser

[RobLoach]

ERROR    2018-09-10 18:28:04,848 [system]:No executable found in ['/usr/sbin/fuser', '/home/rob/.var/app/org.lutris.Lutris/data/lutris/runners/wine/staging-3.12-x86_64/bin/wine']
ERROR    2018-09-10 18:28:04,849 [jobs]:Error while completing task <bound method LutrisThread.stop of <LutrisThread(Thread-35, stopped daemon 140108460185344)>>: 'NoneType' object has no attribute 'split'
<class 'AttributeError'> 'NoneType' object has no attribute 'split'
  File "/app/lib/python3.7/site-packages/lutris/util/jobs.py", line 29, in target
    result = self.function(*args, **kwargs)
  File "/app/lib/python3.7/site-packages/lutris/thread.py", line 238, in stop
    resume_stop = self.stop_func()
  File "/app/lib/python3.7/site-packages/lutris/runners/wine.py", line 1166, in stop
    initial_pids=self.get_pids())
  File "/app/lib/python3.7/site-packages/lutris/runners/wine.py", line 1084, in get_pids
    pids = system.get_pids_using_file(exe)
  File "/app/lib/python3.7/site-packages/lutris/util/system.py", line 323, in get_pids_using_file
    return set(fuser_output.split())

```

[RobLoach]

I haven't worked on it at all.

[RobLoach]

It could be a package locally here if the runtimes don't take it.

[shuriken1812]

Leandro I tested this on RHEL 7 and Fuser problem is still there, dont close it https://gitlab.com/freedesktop-sdk/freedesktop-sdk/issues/427 open it again.