Fix parallel make race: the .vrfy targets verify the .pem but do not
depend on it, so "make -C raddb/certs" can run them before it exists.

--- a/raddb/certs/Makefile
+++ b/raddb/certs/Makefile
@@ -106,7 +106,7 @@
 	chmod g+r server.pem
 
 .PHONY: server.vrfy
-server.vrfy: ca.pem
+server.vrfy: ca.pem server.pem
 	@$(OPENSSL) verify $(PARTIAL) -CAfile ca.pem server.pem
 
 ######################################################################
@@ -158,7 +158,7 @@
 	chmod g+r inner-server.pem
 
 .PHONY: inner-server.vrfy
-inner-server.vrfy: ca.pem
+inner-server.vrfy: ca.pem inner-server.pem
 	@$(OPENSSL) verify $(PARTIAL) -CAfile ca.pem inner-server.pem
 
 ######################################################################