minor comment spelling fixes
output to build.log files similar to portage per pkg build
remove extra newline
respect userpriv during pkg_setup

Fixes failures due to creating directories owned by root with no group
write permissions during pkg_setup that are written into during later
phases when permissions have been dropped (with userpriv set), e.g. the
python-utils-r1 eclass creates ${T}/${EPYTHON} owned as root and during
the compile phase setuptools tries to create the home subdir and fails
since privs have been dropped.