nspawn: load three libraries we'll need later before we fork() a child

src/nspawn/meson.build

@@ -47,6 +47,7 @@ executables += [
                         include_directories('.')
                 ],
                 'dependencies' : [
+                        libmount_cflags,
                         libseccomp_cflags,
                         libselinux_cflags,
                 ],

src/nspawn/nspawn.c

@@ -58,6 +58,7 @@
 #include "image-policy.h"
 #include "in-addr-util.h"
 #include "io-util.h"
+#include "libmount-util.h"
 #include "log.h"
 #include "loop-util.h"
 #include "loopback-setup.h"
@@ -5965,6 +5966,10 @@ static int run(int argc, char *argv[]) {
         if (arg_cleanup)
                 return do_cleanup();
 
+        (void) dlopen_libmount();
+        (void) dlopen_libseccomp();
+        (void) dlopen_libselinux();
+
         r = cg_has_legacy();
         if (r < 0)
                 goto finish;