Revert "Define MSG_NOSIGNAL to 0 on platforms where it is unavailable."
Revert "Define MSG_NOSIGNAL to 0 on platforms where it is unavailable."

This reverts commit 6a0296791d5e81102a12a3142f5be25cb40f9825.

The change breaks build on Fedora Linux.

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