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Code failed to allow for QPDF::getCompressibleObjSet deleting objects from the object cache in case of multiple entries for the same object id. Add fuzz test case 68668.
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Add fuzz case 68377.
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...as well as some cases generated in CI from earlier attempts at fixing this.
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Fix two errors introduced in #1110 and #1112. Since #1110, encountering the invalid indirect reference #1110 -2147483648 n R produces an integer underflow which, if undetected, immediately trigger a logic error. Since #1112, object -1 0 R may be incorrectly identified as an earlier generation of itself and deleted, invalidating a live iterator.
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It is possible to reproduce the failure with this file following the instructions with oss-fuzz, though it does not cause a failure in CI. The failure was introduced in 18c1ffe0df335a46cddbeb96e2cb939d850df9fa.