Revert "Changing build scripts for d2vzw to use exit codes."

This reverts commit 0ae08d777e00d2b3025466a3be43933acb85b0c8.
Revert "changes the d2vzw build script to look for the ktweaker app"

This reverts commit 92778a023f915eea514eb9a8fdc99672189c1300.