[patch] fix hotspot hs20 build on powerpc and powerpc64

[Matthias Klose]

hs20 on powerpc64 fails to build in the java -version check with

   java -version
   The stack size specified is too small, Specify at least 1600k
   Could not create the Java virtual machine.

increased the default to 2048k, for powerpc64 only.

the default zero stack size for 32bit is then 1024k for 32bit archs, 1536k for 
64bit archs and 2048k for powerpc. the remaining bits use the new defaults sizes 
to build corba and the jdk, and something lower, which lets the build fail on 
both powerpc and powerpc64.

bootstrapped on both 32bit and 64bit. That should go the trunk and the branch.

   Matthias
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