new AIX builds

[Dan Million]

I have built and installed GCC 3.1 on AIX 4.3.3 and AIX 5.1:

    - powerpc-ibm-aix4.3.3.0
    - gcc -v output:
      Reading specs from /usr/local/lib/gcc-lib
		/powerpc-ibm-aix4.3.3.0/3.1/specs
      Configured with: /apps/gcc-3.1/configure --with-as=/usr/ccs/bin/as
      Thread model: aix
      gcc version 3.1
    - all languages enabled

    - powerpc-ibm-aix5.1.0.0
    - gcc -v output:
      Reading specs from /usr/local/lib/gcc-lib
		/powerpc-ibm-aix5.1.0.0/3.1/specs
      Configured with: /apps/gcc-3.1/configure --with-as=/usr/ccs/bin/as
      Thread model: aix
      gcc version 3.1

Dan Million
Oak Ridge National Laboratory