f9882b vars/build.vars:gcc*: default ${PKG_GITROOT} to ${DEFAULT_GITROOT}.

Authored and Committed by Lucio Andrés Illanes Albornoz (arab, vxp) 6 years ago
    vars/build.vars:gcc*: default ${PKG_GITROOT} to ${DEFAULT_GITROOT}.
    vars/env.vars:${DEFAULT_BUILD_VARS}: adds GITROOT.
    vars/gcc.vars: always use ${PKG_GITROOT}.
    vars/gcc_{libstdcpp_v3,runtime}.vars: removes unused package vars.
    
        
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