* gnu/packages/games.scm (pinball): Update to 3.1.20201218.
[source]: Tarballs no longer published on sourceforge, so use git-fetch.
[native-inputs]: New field for bootstrapping inputs.
[inputs]: Add libltdl.
[arguments]: Add custom 'bootstrap' phase.
* gnu/packages/patches/pinball-system-ltdl.patch: Adjust to latest source.
* gnu/packages/patches/pinball-const-fix.patch,
gnu/packages/patches/pinball-cstddef.patch,
gnu/packages/patches/pinball-missing-separators.patch,
gnu/packages/patches/pinball-src-deps.patch: Delete upstreamed patches.
* gnu/local.mk (dist_patch_DATA): Remove them.
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