Fix building against oe-core 75bed40

This applies some minor fixes to build openjdk-7-jre against oe-core as of 75bed40:

- license checksums
- SRC-URI (plus CHKSUM) fix in rhino package
- install-fix in openjdk-7-common (needs additional reference to ICEDTEA subdir)
- import required autotools-brokensep.class from current oe-core HEAD