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mk: fix ar padding problems on 64bit (from eriks amd64mkar patch)

--- a/sys/src/cmd/mk/archive.c

+++ b/sys/src/cmd/mk/archive.c

@@ -60,12 +60,12 @@

 	if(symlook(name, S_TIME, 0)){

 		/* hoon off and change it in situ */

 		LSEEK(fd, SARMAG, 0);

-		while(read(fd, (char *)&h, sizeof(h)) == sizeof(h)){

+		while(read(fd, &h, SAR_HDR) == SAR_HDR){

 			for(i = SARNAME-1; i > 0 && h.name[i] == ' '; i--)

-					;

+				;

 			h.name[i+1]=0;

 			if(strcmp(member, h.name) == 0){

-				t = SARNAME-sizeof(h);	/* ughgghh */

+				t = SARNAME-SAR_HDR;	/* ughgghh */

 				LSEEK(fd, t, 1);

 				fprint(fd, "%-12ld", time(0));

 				break;

@@ -101,7 +101,7 @@

 	}

 	at = d->mtime;

 	free(d);

-	while(read(fd, (char *)&h, sizeof(h)) == sizeof(h)){

+	while(read(fd, &h, SAR_HDR) == SAR_HDR){

 		t = atol(h.date);

 		if(t >= at)	/* new things in old archives confuses mk */

 			t = at-1;