AX_CODE_COVERAGE recently changed the way it embedded its Makefile rules
in the output file: instead of using @CODE_COVERAGE_RULES@, users
are now meant to include aminclude_static.am.
The new AX_CODE_COVERAGE is only in the latest autoconf-archive release,
version 2019.01.06, which is inconveniently new, so bundle everything
we need for the moment.
This requires us to stop using the deprecated CODE_COVERAGE_LDFLAGS
(which we still used to support older versions of autoconf-archive)
and replace them with CODE_COVERAGE_LIBS.
Signed-off-by: Simon McVittie <smcv@collabora.com>
