Switch Minizip to native 64-bit fopen(), ftello(), fseeko().
Merge pull request #263 from bentley/minizip64

Switch Minizip to native 64-bit fopen(), ftello(), fseeko().
OpenBSD doesn't use librt. Don't link against it there.
Add OpenBSD to various #ifdefs.
Change the default value of pmove_accurate to 1
Merge remote-tracking branch 'remotes/origin/master' into gameplay/viech