tar: make remove(3) non-fatal when extracting

Handles special cases like: .

tar.c

@@ -259,7 +259,7 @@ unarchive(char *fname, ssize_t l, char b[BLKSIZ])
 	if (!mflag && ((mtime = strtol(h->mtime, &p, 8)) < 0 || *p != '\0'))
 		eprintf("strtol %s: invalid number\n", h->mtime);
 	if (remove(fname) < 0 && errno != ENOENT)
-		eprintf("remove %s:", fname);
+		weprintf("remove %s:", fname);
 
 	tmp = estrdup(fname);
 	mkdirp(dirname(tmp));