Stop testing for sigprocmask.  This is a stop gap measure until I work
out how to just activate my code on platforms where I know it works
(currently only linux/x86).
diff --git a/configure.in b/configure.in
index ffdc279..609ffcb 100644
--- a/configure.in
+++ b/configure.in
@@ -1583,7 +1583,7 @@
  putenv readlink \
  select setegid seteuid setgid setgroups \
  setlocale setregid setreuid setsid setpgid setuid setvbuf snprintf \
- sigaction siginterrupt sigprocmask sigrelse strftime strptime symlink \
+ sigaction siginterrupt sigrelse strftime strptime symlink \
  sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
  truncate uname unsetenv waitpid _getpty getpriority)