remove dependency on GNU sed newline handling in test suite

[rolandwalker]

The issue is that POSIX sed always fills in a trailing newline, whereas GNU sed maintains the input more faithfully.

This is a small file and it seems just as easy to write it with a literal printf.

After #609 this will be sufficient for the test suite to run on OS X and likely any BSD derivative.

[rolandwalker]

Note: this will fail tests without quoting of $@ from #609 .

[jonas]

Thanks I squashed this into the #609 PR