Revert "Make eval.php try to handle newlines in code"

Revert "Make eval.php try to handle newlines in code"

Completely broke the script for me.

<TimStarling> MaxSem: that was a pretty crazy change
<TimStarling> fancy trying to detect the end of a statement by shelling out to detect parse errors
<TimStarling> maybe just revert that?
<TimStarling> we can probably do a better job with a few regexes
<TimStarling> I wonder how php -a does it

This reverts commit f0ae292da7ef0673b30c68b4a6f3789b2eea8464.

Change-Id: I16c9c200dc3f4db55cecc23aaa0d9ff55504c19d