Revamped Mac build to use MPW Interfaces&Libraries.
In particular, the bootstrap script and the default Jambase
settings use the standard MPW tools, headers and libraries
(this package is available from Apple's developer website).
The Jambase also retains some support for the CodeWarrior tools
- this can be enabled by passing -sMETROWERKS=true on the jam
command line. The bootstrap script should also work with
the CodeWarrior MPW package, although it uses only the
standard MPW tools/headers/libs.