I was silly to assume little-endian integer representations for this
test case - of course it fails on big-endian machines. Fixed to use
endian-agnostic character strings.

ref
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56226
https://gcc.gnu.org/ml/gcc-testresults/2016-05/msg00779.html

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Fritz Reese