build: buildLibc now actually outputs 'failed' and cleans up already-built files to avoid a half-built state.
build: buildLibc now actually outputs 'failed' and cleans up already-built files to avoid a half-built state.

jmolloy/pedigree,jmolloy/pedigree,jmolloy/pedigree,jmolloy/pedigree,jmolloy/pedigree,jmolloy/pedigree,jmolloy/pedigree