libseccomp is detected by configure but doesn't appear to have any
effect on the installed image. For now, disable it unconditionally.
https://bugs.gentoo.org/857906

--- emacs-28.2/configure.ac
+++ emacs-28.2/configure.ac
@@ -4373,7 +4373,7 @@
     ]])])
 AC_SUBST([HAVE_SECCOMP])
 
-EMACS_CHECK_MODULES([LIBSECCOMP], [libseccomp >= 2.5.2])
+HAVE_LIBSECCOMP=no
 AC_SUBST([HAVE_LIBSECCOMP])
 AC_SUBST([LIBSECCOMP_LIBS])
 AC_SUBST([LIBSECCOMP_CFLAGS])