Use a less freqent dummy file name: zipdummy

Previously if user has a directory with name dummy in the root of the
source tree, "zip -qd package.apk dummy" fails with:
"zip error: Nothing to do!".
This change mitigates the error.

Change-Id: I642e3bf0378e5b9911a068ecb72f795b3e92f1fe
2 files changed