Powerpc 4.7 build

[jennifer at oarcorp.com]

The tools are now installed under the directory rtems4.7.  This allows
multiple versions of rtems to be used on the same machine.

The target should be powerpc-rtems4.7 instead of powerpc-rtems.

Hope this helps

Jennifer

> Why are the binaries in the tools RPM called powerpc-rtems4.7-gcc rather
> than the standard  powerpc-rtems-gcc?
> What do I need to pass into configure so that it can find these
> executables.
>
> Thx - Greg
>