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QgsCoordinateReferenceSystem::setProj4String(): harden validation
OSRImportFromProj4() may accept strings that are not valid proj.4 strings, e.g if they lack a +ellps parameter, it will automatically add +ellps=WGS84, but as we use the original mProj4 with QgsCoordinateTransform, it will fail to initialize so better detect it now. (cherry-picked and adapted from master 85128c5) Fixes #14844
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