Prepare code for placement new being added to Arduino library

[Pharap]

Minesweeper/Minesweeper/Utils/PlacementNew.h

Lines 29 to 33 in 88648a6

	inline void * operator new (size_t size, void * pointer)
	{
	static_cast<void>(size);
	return pointer;
	}

The Arduino library has recently added placement new to the library,
which will clash with this implementation of placement new and thus prevent compilation.

This code needs to be changed to avoid being defined if the library is suitably recent.