UserlandFS server doesn't compile with DEBUG

[pdziepak]

In debug mode GCC2 doesn't remove unused static inline functions, this causes linking errors in userlandfs server.

The solution is borrowed from libuserlandfs_haiku_kernel.so. Unused but required functions are present with empty implementations or linked using kernelland_emu.

[bonefish]

I don't really like this solution. The server should avoid private kernel headers and it does save for <Notifications.h> to handle the NodeMonitoringEventRequest. It should instead rather delegate the invocation of the listener hook to the respective kernel interface library.

Regarding coding style: The } doesn't go on the same line as the {, even if the function body is empty. Exceptions may be made for lists of reserved methods to avoid unnecessarily bloating the source file (e.g. ​http://cgit.haiku-os.org/haiku/tree/src/kits/interface/View.cpp#n5846), but then the whole function definition is on the same line.

[pulkomandy]

The patch doesn't work anymore, as the scheduler has changed a bit and it provides some of those inlined functions.

I think I don't understand the FS code well enough to do anything here to implement what Ingo suggests, unless given more details. So help fixing this would be very welcome.

[waddlesplash]

BeOS did not have UserlandFS, moving out of R1