Add NATIVE_WINDOWS
Add NATIVE_WINDOWS

With a change of libs, and specifying NATIVE_WINDOWS as TARGET_OS it should compile libleveldb.a and libmemenv.a just fine, it did for me and Diapolo when testing.

reddcoin-project/reddcoin,coinkeeper/2015-06-22_18-46_reddcoin,joroob/reddcoin,coinkeeper/2015-06-22_19-10_cannacoin,reddcoin-project/reddcoin,coinkeeper/2015-06-22_18-46_reddcoin,reddink/reddcoin,coinkeeper/2015-06-22_19-10_cannacoin,ahmedbodi/poscoin,reddcoin-project/reddcoin,coinkeeper/2015-06-22_19-10_cannacoin,coinkeeper/2015-06-22_18-46_reddcoin,Cannacoin-Project/Cannacoin,reddink/reddcoin,ahmedbodi/poscoin,ahmedbodi/poscoin,reddcoin-project/reddcoin,joroob/reddcoin,joroob/reddcoin,joroob/reddcoin,reddcoin-project/reddcoin,bmp02050/ReddcoinUpdates,coinkeeper/2015-06-22_19-10_cannacoin,bmp02050/ReddcoinUpdates,reddcoin-project/reddcoin,Cannacoin-Project/Cannacoin,coinkeeper/2015-06-22_18-46_reddcoin,bmp02050/ReddcoinUpdates,bmp02050/ReddcoinUpdates,Cannacoin-Project/Cannacoin,ahmedbodi/poscoin,coinkeeper/2015-06-22_19-10_cannacoin,Cannacoin-Project/Cannacoin,ahmedbodi/poscoin,reddink/reddcoin,reddink/reddcoin,bmp02050/ReddcoinUpdates,coinkeeper/2015-06-22_18-46_reddcoin,Cannacoin-Project/Cannacoin,reddink/reddcoin,joroob/reddcoin