Cleaned up stdio_{pre|post}.h headers. git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7363 a95241bf-73f2-0310-859d-f6bbb57e9c96
stdio.h will follow later (the headers are currently unused). git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2689 a95241bf-73f2-0310-859d-f6bbb57e9c96