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Returns true if all bits that are set (=1) in mask are also set in self; returns false otherwise.
Example values:
0b1010101  self
0b1010100  mask
0b1010100  self & mask
     true  self.allbits?(mask)

0b1010100  self
0b1010101  mask
0b1010100  self & mask
    false  self.allbits?(mask)
               static VALUE
int_allbits_p(VALUE num, VALUE mask)
    mask = rb_to_int(mask);
    return rb_int_equal(rb_int_and(num, mask), mask);

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