common.mk: preludes

* common.mk (preludes): make prelude.c too.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48374 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

common.mk

@@ -994,6 +994,7 @@ probes.h: {$(VPATH)}probes.$(DTRACE_EXT)
 
 prereq: incs srcs preludes PHONY
 
+preludes: {$(VPATH)}prelude.c
 preludes: {$(VPATH)}miniprelude.c
 preludes: {$(srcdir)}golf_prelude.c