meson: disable siginfo build

siginfo was already disabled in waf builds

See commit 13fa61455c

daemon/meson.build

@@ -40,7 +40,6 @@ daemon_sources = [
   'room_load.c',
   'room_save.c',
   'save.c',
-  'siginfo.c',
   'studio.c',
   'studio_jack_conf.c',
   'studio_list.c',
@@ -48,6 +47,9 @@ daemon_sources = [
   '../string_constants.c',
 ]
 
+# define SIGINFO_ENABLED and build
+#  'siginfo.c',
+
 ladishd = executable('ladishd', daemon_sources,
                      dependencies : deps,
                      include_directories : inc,