[icedtea zero] enable 32bit builds for powerpc

[Matthias Klose]

this may be dropped during the cacao/zero updates; currently all zero builds on
powerpc are done using the 64bit toolchain, not th 32bit toolchain. Adding the
powerpc configury. I can't test a 64bit powerpc build.

  Matthias

2008-07-20  Matthias Klose  <doko at ubuntu.com>

        * acinclude.m4 (SET_ARCH_DIRS): Add powerpc and powerpc64 configs.
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