Snippets for gnome-calls 50.0 from Alpine aarch64

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-aarch64/community/calls/calls-50.0-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>
        |  ^~~~~~~
  

• src/libcalls-vala.a.p/calls-phone-number-query.c:100:14: warning: variable '_match_fields_size_' set but not used [-Wunused-but-set-variable]
    100 |         gint _match_fields_size_;
        |              ^~~~~~~~~~~~~~~~~~~
  

• src/libcalls-vala.a.p/calls-phone-number-query.c:50:20: warning: 'calls_phone_number_query_properties' defined but not used [-Wunused-variable]
     50 | static GParamSpec* calls_phone_number_query_properties[CALLS_PHONE_NUMBER_QUERY_NUM_PROPERTIES];
        |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~