automake: Remove distcheck hack
This was verifying that the autotools build would produce a meson-buildable tarball. That was fine for 1.20 but going forward we should switch to using meson's dist target for the release tarball.
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This was verifying that the autotools build would produce a meson-buildable tarball. That was fine for 1.20 but going forward we should switch to using meson's dist target for the release tarball.