youtube-dl 2013.04.28

Closes #19489.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
libotr 3.2.1

Closes #19485.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
httrack 3.47.6

Closes #19484.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
qemu 1.4.1

Closes #19482.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
qemu: remove out of date comment