Fixes Heap-use-after-free in Assimp::DXFImporter::ExpandBlockReferences #4644
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Fixes Heap-use-after-free in Assimp::DXFImporter::ExpandBlockReferences revealed by fuzzing:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=42899
The root cause is that
bl_src.linesandbl.linesinDXFImporter::ExpandBlockReferencesmay be the same vector. Iterator may become invalid when new objects are pushed into the same vector.