Set up tests for secur32.

diff --git a/configure.ac b/configure.ac
index 5cc6309..b9052ed 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1698,6 +1698,7 @@
 dlls/rsaenh/Makefile
 dlls/rsaenh/tests/Makefile
 dlls/secur32/Makefile
+dlls/secur32/tests/Makefile
 dlls/sensapi/Makefile
 dlls/serialui/Makefile
 dlls/setupapi/Makefile