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Refactoring in commit 6b85166920 (ENH: Refactor find_library search
logic, 2008-09-22, v2.8.0~1665) dropped a call to `FileExists` on the
path under the assumption that the presence of a file in a directory
listing means it exists. However, dropping that also dropped a check
that verifies the file is readable. Restore the `FileExists` call to
ensure that we only find readable libraries.