py-backports.* conflict

[Andriy Gapon]

After the update of devel/py-backports.functools_lru_cache to 1.4 it started to
conflict with devel/py-backports.shutil_get_terminal_size:

py27-backports.functools_lru_cache-1.4 [FreeBSD] conflicts with
py27-backports.shutil_get_terminal_size-1.0.0 [installed] on
/usr/local/lib/python2.7/site-packages/backports/__init__.py

It would be very inconvenient if only a single of py-backports.* ports could be
installed at a time.

Is it possible to fix the problem?

-- 
Andriy Gapon