Added more support for MacOSX

[Fredrik Öhrström]

Now configure works on my 10.6.8 (snow leopard) 
IntelCorei7 imac with 8GB of RAM (64 bit of course).

You can type make, and it will build:
langtools,corba,jaxp and jaxws.

I have just started looking at the macosx port to
get it to compile hotspot and the jdk.

Iw there any MacOSX savy person out there who
could answer what the difference is between 
CC and g++ and llvm-g++ on 10.6.8?

//Fredrik