docker: fix GNU hash QA warning
docker: fix GNU hash QA warning

The docker build isn't properly using CFLAGS/LDFLAGS, which triggers the following
QA error:

  ERROR: docker-1.11.1+git5604cbed50d51c4039b1abcb1cf87c4e01bce924-r0 do_package_qa: QA Issue: No GNU_HASH in the elf binary: 'docker/1.11.1+git5604cbed50d51c4039b1abcb1cf87c4e01bce924-r0/packages-split/docker/usr/bin/docker' [ldflags]
  ERROR: docker-1.11.1+git5604cbed50d51c4039b1abcb1cf87c4e01bce924-r0 do_package_qa: QA run found fatal errors. Please consider fixing them
  ERROR: docker-1.11.1+git5604cbed50d51c4039b1abcb1cf87c4e01bce924-r0 do_package_qa: Function failed: do_package_qa
  ERROR: Logfile of failure stored in: tmp/work/core2-64-overc-linux/docker/1.11.1+git5604cbed50d51c4039b1abcb1cf87c4e01bce924-r0/temp/log.do_package_qa.63906
  ERROR: Task meta-virtualization/recipes-containers/docker/docker_git.bb:do_package_qa (meta-virtualization/recipes-containers/docker/docker_git.bb:do_package_qa) failed with exit code '1'

Signed-off-by: Bruce Ashfield <284cc737d174a260eec2a2a6324a304f84b1ae0f@windriver.com>

lgirdk/meta-virtualization,lgirdk/meta-virtualization,cardoe/meta-virtualization,lgirdk/meta-virtualization,lgirdk/meta-virtualization,cardoe/meta-virtualization,cardoe/meta-virtualization,lgirdk/meta-virtualization