Add deps tracking to builder-funcs.sh

After changing a header, e.g. source/android/support/src/msun/k_log.h,
all translation units including this header are now rebuilt. Previously,
this didn't happen.

Change-Id: I70b26c0e9d6661adf984b50bfd74a20b48c0985c
Merge pull request #13 from awong-dev/deps

Add deps tracking to builder-funcs.sh