MacOS build tool selections for JDK8

[David DeHaven]

>>> JPRT as far as I know only uses 10.7 systems for builds. The 10.8 systems can only be used for testing.
>> Since we have added the compiler and link args described earlier in this thread to jdk8 makefiles, I believe we have enabled 10.8 for building jdk8 too now. At least we intend to.
> 
> Careful with this. The jdk7u builds/makefiles probably still need a 10.7 system.
> With no access to JPRT sources anymore, I can't remember all details, but just declaring 10.8 systems
> able to build 10.7 might not work for jdk7u jobs. Can't remember if I had a solution for this,
> kind of expected the jdk7u makefiles to get changed, but I kind of doubt that happened. :^(

No, 7u has not been changed. At least, whenever I need to have someone test a fix, they have to test on 10.8 :)

-DrD-