6878106: Synchronize CORBA and JDK makefiles where possible
Summary: Add recent changes to the JDK makefile to the CORBA makefile
Reviewed-by: jjg, never
6873059: Explicitly use -source 6 -target 6 when compiling with the boot jdk javac
Summary: The bootstrap javac currently uses the default source and targets of the boot javac
Reviewed-by: jjg, ohair