Enable state_dir support for 2.4.x.

--- mod_md-2.0.8/src/mod_md_config.c.state_dir
+++ mod_md-2.0.8/src/mod_md_config.c
@@ -44,7 +44,7 @@
 /* Default settings for the global conf */
 static md_mod_conf_t defmc = {
     NULL,                      /* list of mds */
-#if AP_MODULE_MAGIC_AT_LEAST(20180906, 2)
+#if 1
     NULL,                      /* base dir by default state-dir-relative */
 #else
     MD_DEFAULT_BASE_DIR,
@@ -898,7 +898,7 @@
         mc->hsts_header = apr_psprintf(p, "max-age=%d", mc->hsts_max_age);
     }
     
-#if AP_MODULE_MAGIC_AT_LEAST(20180906, 2)
+#if 1
     if (mc->base_dir == NULL) {
         mc->base_dir = ap_state_dir_relative(p, MD_DEFAULT_BASE_DIR);
     }