sbuild 0.7.6

Closes #30719.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
chicken: fix build on older Xcodes

Closes #30713.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>
chicken: fix build on CLT-only
chicken: update 4.9.0.1 bottle.