commit c468820ba9 "scripts/build: cleanup"
started to silently remove *.o files from the installation without
giving an explanation why this should be needed.
Drop that as it prevents packages from including *.o files in the
image, which eg is needed to include IR BPF decoders in LibreELEC.
Packages which install *.o files that should not end up in the image
should manually remove these in post_makeinstall_target.
Signed-off-by: Matthias Reichl <hias@horus.com>