merge forward from the python 2.x branch
diff --git a/configure b/configure
index 3655b27..8ff9e91 100755
--- a/configure
+++ b/configure
@@ -9297,7 +9297,7 @@
select sem_open sem_timedwait sem_getvalue sem_unlink setegid seteuid \
setgid \
setlocale setregid setreuid setresuid setresgid setsid setpgid setpgrp setuid setvbuf \
- sigaction siginterrupt sigrelse snprintf strftime strlcpy \
+ sigaction siginterrupt signalfd sigprocmask sigrelse snprintf strftime strlcpy \
sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
truncate uname unsetenv utimes waitpid wait3 wait4 \
wcscoll wcsftime wcsxfrm _getpty