misc: do not use "tar cf - |tar xf -"

Using this: tar cf - -C "/some/place" |tar xf - -C "/some/other/place"
to copy a directory to another place does not properly fail (when it does).

Using this instead: cp -av "/some/place" "/some/other/place"
makes it easy to see why and how it failed.

Impacted:
libc/uClibc
debug/ltrace
tools/sstrip
scripts/populate

source config/global.in

source config/target.in

source config/toolchain.in

source config/kernel.in

source config/binutils.in

source config/cc.in

source config/libc.in

source config/debug.in

source config/tools.in

source config/companion_libs.in