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Add file name in file error reports

--- a/cc1/lex.c

+++ b/cc1/lex.c

@@ -45,9 +45,10 @@

 		fp = stdin;

 		fname = "<stdin>";

 	} else {

-		if ((fp = fopen(fname, "r")) == NULL)

-			die("error opening output:%s", strerror(errno));

-		fname = fname;

+		if ((fp = fopen(fname, "r")) == NULL) {

+			die("error opening input '%s':%s",

+			    fname, strerror(errno));

+		}	

 	}

 	allocinput(fname, fp);

 	*input->begin = '\0';