configure: add --disable-colo-proxy option

Add option to not build filter-rewriter and colo-compare when
they are not needed.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Zhang Chen <chen.zhang@intel.com>
Message-Id: <20230515130640.46035-2-vsementsov@yandex-team.ru>
Signed-off-by: Juan Quintela <quintela@redhat.com>

stubs/colo-compare.c

@@ -0,0 +1,7 @@
+#include "qemu/osdep.h"
+#include "qemu/notify.h"
+#include "net/colo-compare.h"
+
+void colo_compare_cleanup(void)
+{
+}

stubs/meson.build

@@ -46,6 +46,7 @@ stub_ss.add(files('target-monitor-defs.c'))
 stub_ss.add(files('trace-control.c'))
 stub_ss.add(files('uuid.c'))
 stub_ss.add(files('colo.c'))
+stub_ss.add(files('colo-compare.c'))
 stub_ss.add(files('vmstate.c'))
 stub_ss.add(files('vm-stop.c'))
 stub_ss.add(files('win32-kbd-hook.c'))