Snippets for rdma-core 64.0 from Alpine armv7

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-armv7/community/rdma-core/rdma-core-64.0-r0.log.

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