Upgrade to cohttp-0.11.2 and stdext-0.11.0

This has plenty of fallout across a lot of packages!

Signed-off-by: Jon Ludlam <jonathan.ludlam@citrix.com>
This is because of the 'dirty hack' above - cohttp installs its binaries into ${PREFIX}/bin. I could use a %{} macro for the PREFIX value and append /bin on in the spec instead - is there a suitable macro?