Batch of tiny changes for MSVC compiles.

Most of these fall into the category:

  • don't use struct to refer to a class, and vice versa
  • msvc doesn't like unistd.h or dirent.h

Doesn't fix all the struct/class problems; I think I'll silence those for now and move on because it's not all that important.

Tested on OS X.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3571 c06c8d41-db1a-0410-9941-cceddc491573

Created by  pauldubois  on March 9, 2008
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