add hashes for installation

git-svn-id: svn://svn.icculus.org/fs2open@10300 387891d4-d844-0410-90c0-e4c51a9137d3
Coverity ID 1093440: Evaluation order violation in weapon_create()

Related to weapon substitution code
Also a gcc warning (sequence point)

git-svn-id: svn://svn.icculus.org/fs2open@10301 387891d4-d844-0410-90c0-e4c51a9137d3