Fix Coverity 1093734: Copy into fixed size buffer

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9881 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity 1093931 and 1093932: Missing varargs init or cleanup

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9882 387891d4-d844-0410-90c0-e4c51a9137d3