fcaps.eclass: don't assume D and ROOT end with a slash

BUG=b/179427028
TEST=presubmit
RELEASE_NOTE=None

Closes: https://bugs.gentoo.org/655244
Change-Id: I78c00d84456226e5b4ff534fcd2ce52a36c0f1fa
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/portage-stable/+/13216
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
1 file changed