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FortranCInterface: Fix broken search for test exe when cross-compiling

Brad King requested to merge brad.king/cmake:FortranCInterface-cross-compile into master

Previously the find_program call we used to locate the test executable but that can be broken by CMAKE_FIND_ROOT_PATH_MODE_PROGRAM. Instead teach the test project to write a file with the location of the executable it builds. Load that file to get the exact location.

Fixes: #20390 (closed)

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