4cc1cf vars/build.vars:apr{,_util}: explicitly mark dependency.

Authored and Committed by Lucio Andrés Illanes Albornoz (arab, vxp) 7 years ago
    vars/build.vars:apr{,_util}: explicitly mark dependency.
    subr/pkg_clean.subr: defer cleaning packages w/ dependencies.
    vars/env.vars:${DEFAULT_BUILD_VARS}: adds DEPS_{BASE,PARENT}.
    
        
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