04c9799422
Previously the script only parsed [package].dependencies, missing
the build-time-only consumers that the cookbook's
get_build_deps_recursive() picks up via [build].{dependencies,
dev_dependencies}. This caused 'rebuild-cascade.sh relibc' to report
'nothing to do' even though the cookbook correctly identifies
uutils, libpciaccess, relibc-tests, and other packages as relibc
build-dep consumers and rebuilds them under 'make live'.
The fix is to also walk the [build] section. The cookbook's own
parser uses the same convention.