cmake: fix readline find_path call. #9445
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When passing
PATHSandNO_DEFAULT_PATHtofind_pathin CMake,find_pathwill not look into any other location. This will make building on non-canonical *ix based system hard. For exampleGUIXpackage solves this by passing argument:https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/finance.scm#n738