strip_package: source common.sh directly

We're no longer installing this.

BUG=None
TEST=CQ passed

Change-Id: I7a3906763e13e65374c26bb462bbe74b14d0b939
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/1856661
Reviewed-by: Amin Hassani <ahassani@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/host/strip_package b/host/strip_package
index 7c68ef7..8f74e2f 100755
--- a/host/strip_package
+++ b/host/strip_package
@@ -11,8 +11,7 @@
   echo "Script needs to be run from within the chroot!" && exit 1
 fi
 
-SCRIPT_ROOT="/usr/lib/crosutils"
-. "${SCRIPT_ROOT}/common.sh" || exit 1
+. "/mnt/host/source/src/scripts/common.sh" || exit 1
 
 export DEFAULT_INSTALL_MASK
 /usr/lib/devserver/strip_package.py "$@"