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Replace P2ROUNDUP* macro implementations by Linux kernel variants. #423
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This replaces the implementation of P2ROUNDUP* by the implementation used in Linux's round_up() macro. This implementation does not trigger PaX' overflow detection erroneously.
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This replaces the implementation of P2ROUNDUP* by the implementation used in Linux's
round_up()macro: http://lxr.free-electrons.com/source/include/linux/kernel.h?v=3.2#L53. This implementation does not trigger PaX' overflow detection erroneously and thus would fix issue 2505. It was tested by @perfinion and found to be indeed fixing the issue, but a more detailed review is understandable and probably desirable.