bug in latest makefile on webos

[Joshua Marinacci]

Hi guys. I've noticed that the build will break if you do make clean.

this works fine:
        make; make; make
this breaks:
        make; make clean; make

rm -rf lib
make: *** No rule to make target `lib/thumbs.0.5.2.js', needed by 
`lib/phonegap.js'.  Stop.


I think 'make clean' nukes the lib directory, and the thumbs.js is in there 
rather than in the js dir.

- j