distutils.bblass: change order of args to install step

distutils.bblass: change order of args to install step

This let's the user override install-lib argument again if it needs
to be something else, otherwise things like python-setuptools
won't be able to modify the install-lib dir

This fixes a new issue exposed by my previous distutils patch
that fixed the python modules default install location. Also,
it removes running the install step twice which was inadvertant

(From OE-Core rev: 3b23feca31480cc56f55301fd0274e622c40b522)

Signed-off-by: Matthew McClintock <msm@freescale.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>