Replace broken custom cert list script with mainline 3.18.19 version
---

diff --git a/kernel/Makefile b/kernel/Makefile
index 9f8b0d8..a61e4a7 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -144,12 +144,12 @@ endif
 
 kernel/system_certificates.o: $(obj)/x509_certificate_list
 
-quiet_cmd_extract_certs  = EXTRACT_CERTS   $(patsubst "%",%,$(2))
-	cmd_extract_certs  = scripts/extract-cert $(2) $@ || ( rm $@; exit 1)
+quiet_cmd_x509certs  = CERTS   $@
+      cmd_x509certs  = cat $(X509_CERTIFICATES) /dev/null >$@ $(foreach X509,$(X509_CERTIFICATES),; echo "  - Including cert $(X509)")
 
 targets += $(obj)/x509_certificate_list
-$(obj)/x509_certificate_list: scripts/extract-cert $(X509_CERTIFICATES) $(obj)/.x509.list FORCE
-	$(call if_changed,extract_certs,verity-keys)
+$(obj)/x509_certificate_list: $(X509_CERTIFICATES) $(obj)/.x509.list
+	$(call if_changed,x509certs)
 
 targets += $(obj)/.x509.list
 $(obj)/.x509.list: