Simplify case-insensitivity checks on Mac OS X
* src/fileio.c (file_name_case_insensitive_p): Try skipping the Darwin code and instead using pathconf with _PC_CASE_SENSITIVE. Leave in two alternatives conditionally compiled based on DARWIN_OS_CASE_SENSITIVE_FIXME in case pathconf doesn't work. * etc/PROBLEMS: Mention the possible problem with pathconf on Mac OS X.
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