smemcap: use correct tar magic

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>

procps/smemcap.c

@@ -41,7 +41,7 @@ static void writeheader(const char *path, struct stat *sb, int type)
 	sprintf(header.size, "%o", (unsigned)sb->st_size);
 	sprintf(header.mtime, "%llo", sb->st_mtime & 077777777777LL);
 	header.typeflag = type;
-	//strcpy(header.magic, "ustar  "); - do we want to be standard-compliant?
+	strcpy(header.magic, "ustar  "); /* like GNU tar */
 
 	/* Calculate and store the checksum (the sum of all of the bytes of
 	 * the header). The checksum field must be filled with blanks for the