fcaps.eclass: Remove retired co-maint

BUG=b/179427028
TEST=presubmit
RELEASE_NOTE=None

Change-Id: I9da088aa7cf74628aaeea0f7d34c7a6c94491b3b
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/portage-stable/+/13214
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
1 file changed