Don't run gjs tests on sparc64

gjs doesn't seem to work there at all (#827815).

Silence missing-dep-for-interpreter error on sparc64, where we install
the script but do not attempt to run it.

debian/ostree-tests.lintian-overrides

@@ -5,3 +5,6 @@ ostree-tests: extra-license-file usr/lib/installed-tests/ostree/gpg-verify-data/
 
 # This is deliberate, working around the assumption of recursive make
 ostree-tests: symlink-is-self-recursive usr/lib/installed-tests/ostree/tests .
+
+# We won't run this on sparc64 currently
+[sparc64]: missing-dep-for-interpreter gjs => gjs (usr/lib/installed-tests/ostree/corrupt-repo-ref.js)