Snippets for xscreensaver 6.15 from Alpine ppc64le

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-ppc64le/community/xscreensaver/xscreensaver-6.15-r0.log.

• /usr/include/sys/termios.h:1:2: warning: #warning redirecting incorrect #include <sys/termios.h> to <termios.h> [-Wcpp]
      1 | #warning redirecting incorrect #include <sys/termios.h> to <termios.h>
        |  ^~~~~~~
  

• textclient.c:518:32: warning: overflow in conversion from 'long unsigned int' to 'int' changes value from '2148037735' to '-2146929561' [-Woverflow]
    518 |       ioctl (fileno (d->pipe), TIOCSWINSZ, &ws);
        |                                ^~~~~~~~~~