Chris Wong 2c0db5e331 Use printf %s instead of echo -n in build script
According to POSIX, the behavior of `echo -n` is "implementation
defined". So we can't guarantee that it gives the same result
everywhere.

See also:
* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/echo.html
* http://unix.stackexchange.com/q/65803/9814
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