ssh_client: set openssh prefix to /

The --prefix path is used by openssh at runtime to look for files like
/etc/ssh_config.  Using a local build path makes no sense, so change it
to the standard / path.  This also cleans up the generated object files
a bit so it doesn't have things like:
/usr/local/google/home/vapier/chromiumos/src/platform/assets/chromeapps/ssh_client/output/..../etc/ssh_config

Change-Id: Id279552d10f5571834820aa8785b4e2282d34f70
Reviewed-on: https://chromium-review.googlesource.com/466707
Reviewed-by: Brandon Gilmore <varz@google.com>
Reviewed-by: Rob Ginda <rginda@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed