Revert "Check prebuilt sources during checkbuild"

This reverts commit ec8fae6f2e11a772fa97fe6baf895222f7ffdf5d.

Revert this until a few oddball branches can be fixed.

Bug: 32332829
Change-Id: Ic95fa50e36cb32a4d29bf765b1f3d8384140fb0b
2 files changed