Fix #2959 by reverting r10082.  I can probably talk zookeeper into converting the troublesome SCP_vectors into static variables so this isn't causing memset issues.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10132 387891d4-d844-0410-90c0-e4c51a9137d3