tcf-agent: Obey LDFLAGS

Signed-off-by: Drew Moseley <drew_moseley@mentor.com>
blktrace: essentially rework the recipe, obey LDFLAGS

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
(cherry picked from commit aed463414e2e2bf8ca44ba54ee5973e7ed599e57)
Merge pull request #13 from drewmoseley/debug-builds

Fix build failures after moving to 3.8.