eal/windows: add dirent implementation
eal/windows: add dirent implementation

Adding dirent.h on Windows to support common code.
eal_common_options.c includes this file.

The original contribution is under MIT license.
https://github.com/tronkko/dirent

Signed-off-by: Antara Ganesh Kolar <cea0ff12f0b717adbb43a4cc35efaf68402e7704@intel.com>
Signed-off-by: Pallavi Kadam <04c73ddce9f45f6664a05521f1a0d9e2539b2e10@intel.com>
Reviewed-by: Ranjit Menon <d9858831bd71ea8654d16047dffcc62a10524416@intel.com>
Reviewed-by: Keith Wiles <f97a07384723981b442bf4ce37d40edbfd008094@intel.com>
Reviewed-by: Dmitry Kozlyuk <622f8c4298455ea0ac8bf96da29b254c86170938@gmail.com>
Tested-by: Narcisa Ana Maria Vasile <5283ba83793cff89c1ed8a20fdb369f8370a74f0@microsoft.com>
Acked-by: Narcisa Ana Maria Vasile <5283ba83793cff89c1ed8a20fdb369f8370a74f0@microsoft.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk