Bump debhelper compatibility level to 10
Update versioned debhelper build-depency accordingly. Remove "--parallel" and "--with autotools" from debian/rules and drop build-depency on autotools-dev. Use dh_autoreconf with autoreconf-dickey, otherwise FTBFS. Add build-depency on autoconf-dickey for that. Also drop explicitly calling dh_update_autotools_config again. Now implicitly called.
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