* common.mk: removed a comment already has no meaning.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@22799 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

common.mk

@@ -464,8 +464,6 @@ dl_os2.$(OBJEXT): {$(VPATH)}dl_os2.c
 ia64.$(OBJEXT): {$(VPATH)}ia64.s
 	$(CC) $(CFLAGS) -c $<
 
-# when I use -I., there is confliction at "OpenFile"
-# so, set . into environment varible "include"
 win32.$(OBJEXT): {$(VPATH)}win32.c $(RUBY_H_INCLUDES)
 
 ###