bug#18703: chicken fails its test suite on x86_64

[Mark H Weaver]

chicken fails its test suite on x86_64, though it succeeds on both i686
and mips64el.  See:

  http://hydra.gnu.org/job/gnu/master/chicken-4.8.0.3.x86_64-linux

The problem is always the same:

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SRFI 69 procedures
HT - No Parameters
HT - Test Parameter
HT - Number Test Parameter
HT - All Optional Parameters
HT - All Parameters
HT - Insert with setter
HT - Insert with update!
HT - A-List
HT - set! overwrites
HT - Delete
HT - Remove
HT - Make from A-List
HT - Merge!
HT - Merge
HT - Map
HT - Fold
HT - Built-in string hash function
HT - After overwriting 'string-hash' should still work
HT - custom hash function
HT - out of bounds value is caught
Hash collision weaknesses
[panic] out of memory - heap full while resizing - execution terminated
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      Mark