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autoconf-archive 2019-01-06 changed the setup of code coverage support.
Deal with both old and new. Based on Patrick Venture's similar patch in
other repositories[1].

[1] https://github.com/openbmc/phosphor-pid-control/commit/90e9dbcae6c1df3127dd3de41f9d1e1b5a438828



Change-Id: I29dae544d8feb462e848ab00c25da188f74686a7
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>