bird: Do not null-route 100.64/10 prefix as some upstreams might use it

Signed-off-by: Maximilian Wilhelm <max@sdn.clinic>

bird/VRF_external.conf

@@ -37,7 +37,6 @@ protocol static bogon_unreach_ext {
   {%- if proto == 'v4' %}
 	route 0.0.0.0/8		unreachable;	# Host-Subnet
 	route 10.0.0.0/8	unreachable;	# RFC 1918
-	route 100.64.0.0/10	unreachable;	# RFC 6598
 	route 169.254.0.0/16	unreachable;	# APIPA
 	route 172.16.0.0/12	unreachable;	# RFC 1918
 	route 192.0.0.0/24	unreachable;	# IANA RESERVED