Missing legacy vcl header file in otbMosiacFunctors

Tristan Laurentrequested to merge
2484-missing-legacy-vcl-header-file-in-otbmosiacfunctors into develop

Closes #2484 (closed) Solve missing "vcl_sqrt" in OTBMosaicHeaderTest1 in btrfs file system (see explaination here https://github.com/NixOS/nixpkgs/pull/410844#issuecomment-2929617492 ). The solution is to include vcl_legacy_aliases.h which contains VNL_CONFIG_LEGACY_METHODS macro (which vcl_sqrt depends) in otbMosaicFunctors.h .

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