19ab70 etc/build.usage, subr/build_args.subr: adds -C build[,dest[,src]] (clean subdirs) and -p (create package tarballs).

Authored and Committed by Lucio Andrés Illanes Albornoz (arab, vxp) 6 years ago
    etc/build.usage, subr/build_args.subr: adds -C build[,dest[,src]] (clean subdirs) and -p (create package tarballs).
    subr/pkg_clean.subr: given -C, clean build, dest, and/or src.
    subr/pkg_install.subr: given -p, create gzip(1)-compressed package tarball at ${PKG_BASE_DIR}/${PKG_NAME}.tgz.
    vars/env.vars:${DEFAULT_BUILD_STEPS}: adds `clean' post-install.
    
        
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