Snippets for sbcl 2.6.7 from Alpine x86_64

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-x86_64/community/sbcl/sbcl-2.6.7-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>
        |  ^~~~~~~