Fix Python site packages finding in makefile

Because this was using old-style Python `print` statements, it gave a
syntax error in Python 3, causing the `mttools.pth` file to be placed in
the root directory, not the Python site packages directory.

BUG=none
TEST=run `sudo make setup-in-place` in the chroot, and check that
     `mttools.pth` is placed in `/usr/lib64/python3.6/site-packages`.

Change-Id: I043fbf071c0ed2faa5f27067bb3c9b5c2b192058
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/mttools/+/2145325
Tested-by: Harry Cutts <hcutts@chromium.org>
Auto-Submit: Harry Cutts <hcutts@chromium.org>
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Commit-Queue: Harry Cutts <hcutts@chromium.org>
1 file changed