bpo-31904: Add posix module support for VxWorks (GH-12118)

 
diff --git a/configure b/configure
index 6da65dd..a0767b9 100755
--- a/configure
+++ b/configure
@@ -11484,7 +11484,7 @@
  sigtimedwait sigwait sigwaitinfo snprintf strftime strlcpy strsignal symlinkat sync \
  sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
  truncate uname unlinkat unsetenv utimensat utimes waitid waitpid wait3 wait4 \
- wcscoll wcsftime wcsxfrm wmemcmp writev _getpty
+ wcscoll wcsftime wcsxfrm wmemcmp writev _getpty rtpSpawn
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"