Log Message:
- move PLIST elements not found on powerpc to PLIST.i386
- include bsd.pkg.mk explicitly, rather than in Makefile.common
- replace dependency on linuxppc_lib with suse_base to get a
    sufficiently recent glibc
- teach the remaining two usages of `uname -m` output about our
    various powerpc platforms

This makes the Blackdown JRE finally work on powerpc again.

Note that suse_base requires a Linux kernel version >= 2.2.
NetBSD-current's COMPAT_LINUX reports itself as 2.4.18 by default
on i386 and powerpc. On NetBSD/powerpc 1.6, you'll need to override
the default value of the "emul.linux.kern.osrelease" sysctl. On
NetBSD < 1.6, you can try setting the sysctl, but the emulation
may be insufficient to run this software properly.

Also note that on powerpc, you must specify the "-green" option,
because the Classic VM hangs.