eal/windows: add headers for compatibility

eal/windows: add headers for compatibility

Added headers to support Windows environment for common source.
These headers will have Windows specific implementions of the
system library APIs provided in Linux and FreeBSD.

Signed-off-by: Anand Rawat <anand.rawat@intel.com>
Signed-off-by: Pallavi Kadam <pallavi.kadam@intel.com>
Reviewed-by: Jeff Shaw <jeffrey.b.shaw@intel.com>
Reviewed-by: Ranjit Menon <ranjit.menon@intel.com>
Acked-by: Harini Ramakrishnan <harini.ramakrishnan@microsoft.com>