drop references to src/scripts/lib/

Since the lib subdir is empty now (all files have been deleted or moved),
referencing it in the Python search path doesn't make sense.  Drop it.

TEST=precq passes

Change-Id: I7affb19d76801f94c6e1372c864bdcf787d7334d
Reviewed-on: https://chromium-review.googlesource.com/1499908
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
4 files changed