runner: use poll.h in includes

sys/poll.h is non-standard and including it on musl produces a warning.

Signed-off-by: Reagan Bohan <reagan@ourmail.work>
Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>

runner/executor.c

@@ -16,7 +16,6 @@
 #include <sys/ioctl.h>
 #include <sys/mman.h>
 #include <sys/select.h>
-#include <sys/poll.h>
 #include <sys/signalfd.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
@@ -25,6 +24,7 @@
 #include <sys/utsname.h>
 #include <sys/wait.h>
 #include <dirent.h>
+#include <poll.h>
 #include <time.h>
 #include <unistd.h>