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Autogen: Fix header detection for paths with symbolic links

Sebastian Holtermann requested to merge sebholt/cmake:autogen_header_in_symbolic_path_fix into master

When Autogen searches the header for a source files in a target, the expanded real path is used and not the (possibly symbolic) original path of the source file. If the source file path contains symbolic links, then the correct cmSourceFile instance of the header won't be found, but a new one will be generated. This way all header source file properties get lost, which is problematic especially for the SKIP_AUTOMOC/UIC/GEN properties.

This patch changes the header detection in Autogen to use the original source file path instead of the expanded real source file path.

Fixes: #19346 (closed)

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