[Bug 740557] videotestsrc: add ball motion based on system clock

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=740557

--- Comment #29 from Jan Schmidt <thaytan at noraisin.net> ---
Updated to fix a small floating point error that sometimes takes the sqrt of a
very small negative number.

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