mm: ZwAllocateVirtualMemory behavior in ReactOS differs from W2K3

ZwAllocateVirtualMemory behaves differently than in W2k3. The documentation of the function states that the the allocation size is rounded to the next host page boundary. I have created a simple test which allocates memory at a specific custom base address and the allocated size differ in windows and in ROS.

The test can be found in http://jira.reactos.org/browse/ROSTESTS-87