Snippets for gnome-calls 50.0 from Alpine armhf

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-armhf/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>
      |  ^~~~~~~

/usr/include/gstreamer-1.0/gst/gstbuffer.h:43:50: warning: cast increases required alignment of target type [-Wcast-align]
   43 | #define GST_BUFFER_CAST(obj)                    ((GstBuffer *)(obj))
      |                                                  ^

/usr/include/gstreamer-1.0/gst/gstmessage.h:378:10: warning: cast increases required alignment of target type [-Wcast-align]
  378 |   return (GstMessage *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (msg));
      |          ^

/usr/include/gstreamer-1.0/gst/gstmessage.h:211:51: warning: cast increases required alignment of target type [-Wcast-align]
  211 | #define GST_MESSAGE_CAST(obj)                    ((GstMessage*)(obj))
      |                                                   ^

/usr/include/gstreamer-1.0/gst/gstevent.h:430:10: warning: cast increases required alignment of target type [-Wcast-align]
  430 |   return (GstEvent *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (event));
      |          ^

/usr/include/gstreamer-1.0/gst/gstevent.h:243:42: warning: cast increases required alignment of target type [-Wcast-align]
  243 | #define GST_EVENT_CAST(obj)             ((GstEvent *)(obj))
      |                                          ^

../src/calls-network-watch.c:198:7: warning: cast increases required alignment of target type [-Wcast-align]
  198 |   h = (struct nlmsghdr *) self->buf;
      |       ^

../src/calls-network-watch.c:226:7: warning: cast increases required alignment of target type [-Wcast-align]
  226 |   h = (struct nlmsghdr *) self->buf;
      |       ^

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];
      |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

/usr/include/sofia-sip-1.13/sofia-sip/msg_header.h:216:12: warning: cast increases required alignment of target type [-Wcast-align]
  216 |     return (msg_param_t **)((char *)h + h->h_class->hc_params);
      |            ^