[PATCH v2] Add gdb remote protocol backend to strace

[Stan Cox]

Repost of 
https://lists.strace.io/pipermail/strace-devel/2020-December/010283.html
with CI "coverage" fixes.  Hopefully all CI issues are addressed now.

Add gdbserver backend

Add gdbserver backend as an alternate backend, which uses the GDB
remote system protocol to communicate with the gdbserver.  The
main loop gets a packet from gdbserver, massages packet into
struct tcb_wait_data, registers into ARCH_IOVEC_FOR_GETREGSET,
returns to dispatch_event, which continues gdbsserver.
Usage gdbserver --multi :54321 & strace  --gdbserver 54321 program
The protocol is described in: info gdb 'Remote Protocol' Packets

* (configure.ac, Makefile.am, tests/Makefile.am): Support gdbserver
* defs.h (trace_syscall, update_personality)
(arch_iovec_for_getreset):  Allow access by gdbserver
* gdbserver/(gdbserver.c, protocol.c, gdbserver.h, protocol.h)
(signals.def, signals.h, x86_64/gdb_arch_defs.h)
(x86_64/gdb_get_regs.c):  New gdbserver backend.
* strace.1.in:  Document --gdbserver option.
* strace.c (detach, startup_attach, startup_child, init, cleanup)
(next_event, dispatch_event):  Support gdbserver
* syscall.c (+arch_iovec_for_getregset, get_regs, get_scno):  Support 
gdbserver
* ucopy (umoven):  Likewise.
* upeek.c (upeek):  Likewise.
* upoke (upoke): Likewise
* (tests/gdbrsp.test, tests/gdbrsp.c):  New gdbserver test.

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