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Use exported vars instead of MAKEFLAGS for coverage options

Since GNU make 4.4 (Debian trixie) variable definitions appended to
MAKEFLAGS in debian/rules are consumed by the parsing make instance
and no longer reach sub-makes spawned by debhelper (dh_auto_build,
dh_auto_test). As a result the package was built in release mode
without --coverage, gcovr never ran, and the CI coverage.xml ended up
empty, making coveralls fail with 'nothing to report'.

Export DEBUG, COV_REPORT and COV_FAIL_UNDER as environment variables
instead: they survive the debhelper hop and work with make 4.3 and 4.4.

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