monitor: Remove target_monitor_defs()

target_monitor_defs() is now only a dead stub. Remove as pointless.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20260427080738.77138-31-philmd@linaro.org>

stubs/meson.build

@@ -75,7 +75,6 @@ if have_system
     stub_ss.add(files('igvm.c'))
   endif
   stub_ss.add(files('kvm.c'))
-  stub_ss.add(files('target-monitor-defs.c'))
   stub_ss.add(files('win32-kbd-hook.c'))
   stub_ss.add(files('xen-hw-stub.c'))
   stub_ss.add(files('qmp-arm-gic.c'))

stubs/target-monitor-defs.c

@@ -1,7 +0,0 @@
-#include "qemu/osdep.h"
-#include "monitor/hmp.h"
-
-const MonitorDef *target_monitor_defs(void)
-{
-    return NULL;
-}