update qt5 build shell script

guowenxue

2019-08-08 47f7b47c8443994cf11be904407db826476f911f

 apue/1.File_IO/ds18b20.c

@@ -116,5 +116,7 @@
    /* convert string value to float value */
    *temp = atof(ptr)/1000;
   
    close(fd);

    return 0;
}