bpo-41625: Expose the splice() system call in the os module (GH-21947)

diff --git a/configure b/configure
index 491869e..e665d13 100755
--- a/configure
+++ b/configure
@@ -11726,7 +11726,7 @@
  sched_get_priority_max sched_setaffinity sched_setscheduler sched_setparam \
  sched_rr_get_interval \
  sigaction sigaltstack sigfillset siginterrupt sigpending sigrelse \
- sigtimedwait sigwait sigwaitinfo snprintf strftime strlcpy strsignal symlinkat sync \
+ sigtimedwait sigwait sigwaitinfo snprintf splice strftime strlcpy strsignal symlinkat sync \
  sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
  truncate uname unlinkat utimensat utimes vfork waitid waitpid wait3 wait4 \
  wcscoll wcsftime wcsxfrm wmemcmp writev _getpty rtpSpawn