5718ef vars/build.vars: remove ${ENV_VARS_EXTRA} hacks in favour of ${PKG{,_}CONFIG}.

Authored and Committed by Lucio Andrés Illanes Albornoz (arab, vxp) 6 years ago
    vars/build.vars: remove ${ENV_VARS_EXTRA} hacks in favour of ${PKG{,_}CONFIG}.
    subr/ex_pkg_env.subr: export ${PKG{,_}CONFIG} and ${PKG_CONFIG_LIBDIR} during non-host builds.
    
        
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