scons: Move imports below version checks in site_init.py.

Without knowing for sure we're using python 3, it's dangerous to start
pulling in code which may make that assumption.

Change-Id: Ic13af74a686ee0fb8f36bb672beadea4334b431c
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40966
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
1 file changed