Add code coverage configuration file
Exclude build/ from code coverage, otherwise build/pnp-id-table.c is included in the stats. Also add subprojects/ which is added by default by Meson unless there is a custom config file.
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Exclude build/ from code coverage, otherwise build/pnp-id-table.c is included in the stats. Also add subprojects/ which is added by default by Meson unless there is a custom config file.