John Rose's incremental bsd-port build script

[Charles Oliver Nutter]

Frank and John and I were talking about the build workflow for MLVM and 
I volunteered to post the incremental build script John showed me.

http://gist.github.com/122576

Usage of the script is like this

(from sources dir)

sh build.sh BUILD_{HOTSPOT,LANGTOOLS}=false make

...to build only jdk (usually doesn't seem to work for me)

sh build.sh BUILD_HOTSPOT=false make

...to build everything except hotspot (works for me)

sh build.sh make

...to build everything (also works for me)

You'll obviously want to modify the variables to point at your jdk plugs 
dir, etc.

- Charlie