bootstrap-prefix: use full path for do_emerge_pkgs
#37
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In the stage3 bootstrap we always prefer to use tools that have been built for stage3; to accomplish this we ensure that it is the first thing evaluated in PATH. Unfortunately, Portage, Python, and Python-exec are often pulled into the depgraph at some point before we're fully boostrapped. To ensure that we don't try and execute ${EPREFIX}/usr/bin/emerge before we're ready, always provide the full path to the bootstrap Python interpreter and emerge script.