Commit 9473 from anitpodes to prevent standalone crashing never ported over.  Original commit message:
"From Eli2: Lower the value of MAX_SHIPS_PER_PACKET to 64 in order to keep packet size down"

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9565 387891d4-d844-0410-90c0-e4c51a9137d3