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Position independence: $PREFIX-populate has absolute paths

Just discovered that $PREFIX-populate has absolute paths.  I suggest 
changing tools/populate.in so that the lines:

CT_READELF="@@CT_READELF@@"
CT_SYSROOT_DIR="@@CT_SYSROOT_DIR@@"

read something closer to:

CT_HERE="$(dirname "$0")"
CT_READELF="$CT_HERE/@@CT_PREFIX@@-readelf"
CT_SYSROOT_DIR="$CT_HERE/../@@CT_PREFIX@@/sys-root"

(Here I'm assuming there's something like CT_PREFIX symbol to substitute 
here.)

Is it as simple as this?


P.S. As a bash style I'd prefer to write
	(( ${still_needed} ))
in preference to
	[ ${still_needed} -eq 1 ]
on the grounds that it's an honest boolean test.

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