With python_targets_python2_7, backports-functools-lru-cache is needed at runtime.
It is also needed at build time with USE=test,
or with USE=doc if python2_ is the only element in PYTHON_TARGETS.
Therefore, Ive added it to COMMON_DEPEND.
Closes: https://bugs.gentoo.org/637588
Package-Manager: Portage-2.3.14, Repoman-2.3.6
The released source tarball of matplotlib-2.1.0 has many files missing.
I've checked out the v2.1.0 tar from their git and prepared a better tarball.
Closes: https://bugs.gentoo.org/636848
Package-Manager: Portage-2.3.13, Repoman-2.3.4
