cmake/FindLibIntl.cmake: handle passive case explicitly
If check_c_source_compiles() succeeded (HAVE_WORKING_LIBINTL is set) then the result of find_xxx() doesn't matter. This happens on systems (linux+glibc) where libintl is available passively. This allows `find_package(LibIntl REQUIRED)` to work and will still correctly fail (REQUIRED) on systems lacking libintl.
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