Fix/endianness #6

Job	Run time
build (--mini-tests)	2m 1s
build (--mini-tests)	2m 24s
build (--std-tests)	1m 58s
build (--std-tests)	2m 0s
build (--test-libcore)	1m 47s
build (--test-libcore)	2m 5s
build (--extended-rand-tests)	2m 3s
build (--extended-rand-tests)	2m 3s
build (--extended-regex-example-tests)	2m 0s
build (--extended-regex-example-tests)	2m 29s
build (--extended-regex-tests)	1m 50s
build (--extended-regex-tests)	2m 5s
build (--test-successful-rustc --nb-parts 2 --current-part 0)	1m 54s
build (--test-successful-rustc --nb-parts 2 --current-part 0)	2m 1s
build (--test-successful-rustc --nb-parts 2 --current-part 1)	1m 58s
build (--test-successful-rustc --nb-parts 2 --current-part 1)	2m 9s
build (--test-failing-rustc)	2m 38s
build (--test-failing-rustc)	1m 59s
	37m 24s

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