Pkgcheck

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- pkgcheck scan: Fix raw repo creation for overlays.

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- Add support for identifying misplaced eclass spec variables (309).

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- Don't include bash parser shared library in tarball and build platform
dependent wheels with the library prebuilt.

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- MetadataVarCheck: Add KEYWORDS verification (303).

- GitAddon: Store commit timestamp instead of date string.

- MissingLocalUseDesc: Add explicit result for local use flags missing
descriptions.

- DirectStableKeywords: Skip acct-group and acct-user categories (308).

- PackageMetadataXmlCheck: Support proxied metadata.xml attribute.

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- MisplacedVariable: New keyword flagging variables used outside their defined
scope.

- ReadonlyVariable: New keyword flagging read-only variables that are globally
assigned (300).

- pkgcheck.utils: Fallback to assuming libstdc++ exists for build_library()
(299).

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- Update tree-sitter-bash to language version 13 to work with
>=tree-sitter-0.19.0.

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