e30e0a subr/build_init.subr:buildp_init_env(): default to -P jobs count to ${DEFAULT_BUILD_CPUS}/2 or 1.

Authored and Committed by Lucio Andrés Illanes Albornoz 4 years ago
    subr/build_init.subr:buildp_init_env(): default to -P jobs count to ${DEFAULT_BUILD_CPUS}/2 or 1.
    subr/build_init.subr:buildp_init_env(): reject invalid -P job counts.
    etc/build.usage: updated.
    
        
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