Snippets for llvm 22.1.8 from Alpine s390x

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-s390x/main/lldb/lldb-22.1.8-r0.log.

• /usr/include/sys/poll.h:1:2: warning: redirecting incorrect #include <sys/poll.h> to <poll.h> [-W#warnings]
      1 | #warning redirecting incorrect #include <sys/poll.h> to <poll.h>
        |  ^