[yocto] [prelink-cross][patch] Fix layout1 test on x86_64 x32.

[Andrew Stubbs]

Hi Mark,

The layout1 test case currently fails for x32 because there is 
insufficient address space for all the libraries.

There's two ways to fix this:

1. Increase mmap_end such that there's more space.

2. Reduce max_page_size so that less space is wasted.

I'm not sure what the implications of option 2 would be, so the attached 
patch implements option 1.

This still limits the number of possible libraries somewhat severely, 
but it's more than enough to pass the layout1 test.

Andrew
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