Do not test machine and OS-specific integers

These values are machine and OS-dependent.
ImageMagick 6.8.9 (r15243) has the following definitions:

magick/resource.c:110:

    MagickULLConstant(1536)*1024*1024, /* memory limit */
    MagickULLConstant(3072)*1024*1024, /* map limit */
    MagickResourceInfinity,            /* disk limit */
    MagickULLConstant(768),            /* file limit */

magick/magick-type.h:36:

    #  define MagickULLConstant(c)  (MagickSizeType) (c ## ULL)

magick/magick-type.h:151:

    typedef unsigned long long MagickSizeType;

When building on Windows, other definitions take place.
So, I think the initial values should not be in the tests at all.