Fix 32-bit build errors in zstd seekable format #3452
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We want to add 32-bit fuzzing for zstd in oss-fuzz (google/oss-fuzz#9498) but the build is currently failing because of conversions from
unsigned long longtosize_tthat occur inZSTD_seekable_decompress().To solve this, we cast to
size_t, which should be safe in this context since these values are working on contiguous buffers.