Exposing POSIX symbols could break consumer POSIX compatibility code.

* Make renaming of close() and unlink() private to EAL.

* Remove renaming of strncasecmp(), strtok_r(), and sleep()
  in favor of using EAL wrappers. Similarly remove PATH_MAX macro.

* Replace index(3p), which is not available on Windows, with strchr(3),
  as recommended by POSIX.1-2008. strerror_r() is only used inside EAL,
  rename it only where it's needed. Same for asprintf(), it has an
  internal EAL wrapper and is removed from public API.

Signed-off-by: Dmitry Kozlyuk <redacted>
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Acked-by: Khoa To <redacted>