Revert r82089.  Commit was intended for a branch.
diff --git a/configure b/configure
index 8ff9e91..3655b27 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 signalfd sigprocmask sigrelse snprintf strftime strlcpy \
+ sigaction siginterrupt 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