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enable-audit.bbclass is only used by systemd. And systemd has adapted to
use build tool meson and implement PACKAGECONFIG audit in recipe file of
systemd in oe-core.

So remove implement of PACKAGECONFIG audit from enable-audit.bbclass.
Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>