Remove "biod" from cryptohome's CROS_WORKON_SUBTREE

cryptohome uses the biod_proxy shared library, whose headers are
inside the biod source tree. Instead of adding biod to the
CROS_WORKON_SUBTREE to fetch the headers, install the headers with
the biod_proxy ebuild, because that's the standard portage way, and
future packages that use biod_proxy won't need to modify their
CROS_WORKON_SUBTREE.

BUG=chromium:1090823
TEST=emerge-nami --unmerge biod
     then: FEATURES=test emerge-nami cryptohome cryptohome-dev-utils
     Observe that biod is not built, but biod_proxy is built.

Cq-Depend: chromium:2277058
Change-Id: I0423f96c78eec679a75b502a4aeeb820502309c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2277262
Commit-Queue: Yicheng Li <yichengli@chromium.org>
Tested-by: Yicheng Li <yichengli@chromium.org>
Reviewed-by: Allen Webb <allenwebb@google.com>
Reviewed-by: Tom Hughes <tomhughes@chromium.org>
3 files changed