Force a probe module build for old, whitelisted kernel versions

scripts/build-probe-binaries

@@ -526,6 +526,11 @@ if [ -z "$KERNEL_TYPE" ]; then
 	do
 		debian_build $URL
 	done
+	# XXX agent/434 - We need to force a build for certain kernel versions
+	# because they are still in use by some GCE customers but the headers
+	# are no longer available from the mirror. We pass the URL but nothing
+	# needs to be downloaded because we already have it cached on the builder.
+	debian_build https://mirrors.kernel.org/debian/pool/main/l/linux/linux-headers-3.16.0-4-amd64_3.16.36-1+deb8u2_amd64.deb
 
 	#
 	# Oracle RHCK build