edje: make the generated default program name reproducible over builds
For programs without specific names edje_cc generated default names in
the form of program_$MEMORY_ADDRESS. That worked well enough for keeping
the names unique, but it causes problems if one wants to have these files
being binary reproducible due to different memory layouts, compilers,
etc. Simply using a counter as unique part should work well enough for
our use case and help people who want to verify builds.
Thanks a lot to Bernhard M. Wiedemann for review and testing.