Support for gdb on native targets
Support for gdb on native targets

- Adds a mechanism for sending SIGTRAP from libsb2; this is needed
  because exec() implementation uses the "explicit ld.so starting"
  approach and not direct exec() on native targets (i.e. when
  target cpu == host cpu)

- Implemented by Gergely Risko <gergely@risko.hu>

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