Add autoconf tests for keyctl01 required features.

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
diff --git a/configure.ac b/configure.ac
index ee5a9fd..c5f213b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -87,6 +87,7 @@
 LTP_CHECK_SELINUX
 LTP_CHECK_SIGNAL
 LTP_CHECK_SYSCALL_EVENTFD
+LTP_CHECK_SYSCALL_KEYCTL
 LTP_CHECK_SYSCALL_MODIFY_LDT
 LTP_CHECK_SYSCALL_NUMA
 LTP_CHECK_SYSCALL_QUOTACTL