[cmake-developers] [PATCH] Don't use /ZmXXXX for MSVC11+

[Adam Moss]

    /Zm1000 considered harmful in VS2012 (this is probably true of >=VS2005 - but I've erred on the side of leaving things alone for configurations I haven't tested.)
    Only use /Zm on MSVC versions older than 11.
    This was making each compiler instance reserve around 750MB immediately, which in a parallel build would make some or all of the spawned compilers crash depending on system memory pressure.
    See: http://msdn.microsoft.com/en-us/library/bdscwf1c.aspx

Cheers,
--Adam
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