build: Move lcovrc file to root so it’s picked up by Meson
Move the lcovrc file to the root of the project, so that it’s picked up
by Meson when running ninja coverage
locally.
See https://github.com/mesonbuild/meson/issues/4628
This won’t affect the code coverage run on the CI, since that explicitly used the lcovrc file already.
Signed-off-by: Philip Withnall pwithnall@endlessos.org