Don't specify the jmake depfile if it doesn't exist
Review Request #2012 - Created March 31, 2015 and submitted
|areitz, dturner-tw, ity|
- Don't specify the depfile to jmake if it doesn't exist.
This is the second of the whack-a-mole fixes to achieve backwards compatibility for the last 2 months of changes. I will resume work on https://rbcommons.com/s/twitter/r/2009/ after this release.