bash-completion-r1.eclass: Upgrade to upstream

Upgrade this eclass for supporting EAPI 7.

Used in dev-libs/opensc package.

BUG=chromium:916403
TEST=build package with EAPI7 which inherit this eclass

Change-Id: I7bede97892b1be23e03e0da2d428261444dcd690
Reviewed-on: https://chromium-review.googlesource.com/1397100
Commit-Ready: Meng-Huan Yu <menghuan@chromium.org>
Tested-by: Meng-Huan Yu <menghuan@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed