[PATCH v2] Add gdb remote protocol backend to strace

[Stan Cox]

Reposting of
  https://lists.strace.io/pipermail/strace-devel/2020-November/010264.html
with recent upstream changes merged in, whitespace and cpp bracketing 
errors fixed.

This patch was reworked to reduce the complexity by
replacing the backend dispatch mechanism, which although perhaps a bit
elegant for the task at hand, greatly increased the complexity of the
patch.  gdbserver specific calls are now bracketed (8 in strace.c, 1
each in syscall.c, ucopy.c, upeek.c, upoke.c) with
#ifdef ENABLE_GDBSERVER
    ...call equivalent routine in gdbserver.c
#endif

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