trace: Do not try to include QMP commands in user emulation binaries

QMP is not available on user emulation; there is not monitor.
Besides, since commit a0e61807a3 ("qapi: Remove QMP events
and commands from user-mode builds") we don't generate the
qapi-commands-trace.h header in a user-emulation-only build.

Remove the QMP trace commands from qemu-user binaries.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20221220150417.26751-1-philmd@linaro.org>

trace/meson.build

@@ -89,4 +89,6 @@ if 'ftrace' in get_option('trace_backends')
   trace_ss.add(files('ftrace.c'))
 endif
 trace_ss.add(files('control.c'))
-trace_ss.add(files('qmp.c'))
+if have_system or have_tools or have_ga
+  trace_ss.add(files('qmp.c'))
+endif