- it's now much cleaner than before
- it now actually works in combination with realloc() (the fix from before didn't work)
- got rid of the WALL_ALIGNMENT definition
- can now handle different WALL_SIZEs
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12820 a95241bf-73f2-0310-859d-f6bbb57e9c96