meson - systemd - fix check to systemd209+ checks that were not done

autofoo did these and set defines code relied on. meson did not. this
fixes that and makes meson do the same checks with the same defines.

src/lib/eina/meson.build

@@ -264,6 +264,9 @@ if get_option('systemd') == true
   systemd = dependency('libsystemd')
   eina_deps += systemd
   config_h.set('HAVE_SYSTEMD', '1')
+  if systemd.version().version_compare('>=209')
+    config_h.set('HAVE_SYSTEMD_LOGIN_209', '1')
+  endif
 else
   systemd = []
 endif