
On Fedora 33 when compiling NetworkManager it is failing with the
following error:
```
ERROR: files left in build directory after distclean:
./docs/libnm/libnm.actions
make[1]: *** [Makefile:18427: distcleancheck] Error 1
make[1]: Leaving directory '/builddir/nm-build/NetworkManager/NetworkManager-1.27.90/_build/sub'
make: *** [Makefile:18356: distcheck] Error 1
Error make distcheck
```
Adding the file to the DISTCLEANFILES will enforce the removal of this
file.
Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/659
(cherry picked from commit 9a935e516e
)