Bugfix and system mode support.
Ben Avison authored
Detail:
  * Fixed signed pointer comparison: most top-bit-set pointers passed to
    _kernel_raise_error() were being translated into "Exit called"
  * Stack extension is now permitted in SYS mode; includes support in longjmp()
Admin:
  Verified that stack extension works.

Version 5.51. Tagged as 'RISC_OSLib-5_51'
38e071b3
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s Bugfix and system mode support.