meson: add the 221 version to the libsystemd dependency

The sd-bus interface we're using wasn't public until 221.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
(cherry picked from commit 8353eeb)

meson.build

@@ -523,7 +523,7 @@ if get_option('tests')
 	config_h.set10('HAVE_LIBUNWIND', dep_libunwind.found())
 
 	# for inhibit support during test run
-	dep_libsystemd = dependency('libsystemd', required : false)
+	dep_libsystemd = dependency('libsystemd', version : '>= 221', required : false)
 	config_h.set10('HAVE_LIBSYSTEMD', dep_libsystemd.found())
 
 	lib_litest_sources = [