prepare-root: Fix compilation with --with-static-compiler

Closes: https://github.com/ostreedev/ostree/issues/1845

Closes: #1846
Approved by: akiernan

src/switchroot/ostree-prepare-root.c

@@ -47,7 +47,11 @@
 #include <errno.h>
 #include <ctype.h>
 
-#ifdef HAVE_LIBSYSTEMD
+#if defined(HAVE_LIBSYSTEMD) && !defined(OSTREE_PREPARE_ROOT_STATIC)
+#define USE_LIBSYSTEMD
+#endif
+
+#ifdef USE_LIBSYSTEMD
 #include <systemd/sd-journal.h>
 #define OSTREE_PREPARE_ROOT_DEPLOYMENT_MSG SD_ID128_MAKE(71,70,33,6a,73,ba,46,01,ba,d3,1a,f8,88,aa,0d,f7)
 #endif
@@ -79,7 +83,7 @@ resolve_deploy_path (const char * root_mountpoint)
   if (stat (deploy_path, &stbuf) < 0)
     err (EXIT_FAILURE, "stat(%s) failed", deploy_path);
   /* Quiet logs if there's no journal */
-#ifdef HAVE_LIBSYSTEMD
+#ifdef USE_LIBSYSTEMD
   const char *resolved_path = deploy_path + strlen (root_mountpoint);
   sd_journal_send ("MESSAGE=Resolved OSTree target to: %s", deploy_path,
                    "MESSAGE_ID=" SD_ID128_FORMAT_STR,