[patch] fix build on architectures with a signed size_t

[Matthias Klose]

attached are three patches to build on architectures with a signed size_t
(s390-linux-gnu).

 - jdk-signed-size_t.diff, there's already a compat SSIZE_T macro in the code,
   just use it.

 - hotspot-idx_t-signed-size_t.diff, the BitMap code assumes a unsigned
   size_t.

 - hotspot-params-signed-size_t.diff, command line parameters of type
   size_t currently are not supported. As a workaround, add casts. This
   may be better addressed.

Matthias
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