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[cc1] Do it like gcc. Fix -M output.

Change the format from:
filename.ext: dependencies
to:
filename.o: filename.ext dependencies

--- a/cc1/lex.c

+++ b/cc1/lex.c

@@ -90,7 +90,9 @@

 addinput(char *fname, Symbol *hide, char *buffer)

 {

 	FILE *fp;

+	char *extp;

 	unsigned flags;

+	size_t infileln;

 	Input *newip, *curip = input;

 	if (hide) {

@@ -105,8 +107,13 @@

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

 			return 0;

 		flags = IFILE;

-		if (curip && onlyheader)

-			printf("%s: %s\n", infile, fname);

+		if (curip && onlyheader) {

+			infileln = strlen(infile);

+			if (extp = strrchr(infile, '.'))

+				infileln -= strlen(extp);

+			printf("%.*s.o: %s %s\n",

+			       infileln, infile, infile, fname);

+		}

 	} else {

 		/* reading from stdin */

 		fp = stdin;