bug#25323: Tail on Ubuntu on Windows: unrecognised file system type 0x53464846

[Luke Moll]

While using tail -f in the Windows Subsystem for Linux, I received the
following error:

tail: unrecognised file system type 0x53464846 for ‘ls.txt’. please report
this to address@hidden reverting to polling

The file still updated as it was written to, and didn't crash or anything,
but I thought I'd do my duty and report this. I'm sure this is a very niche
use case. I'm using Windows 10 Version 1607, build 14393.576

Thanks for the GNU goodness!