Added an implementation of the MSVCRTD.DLL debugging C runtime DLL.

diff --git a/configure.ac b/configure.ac
index c2e8284..0030b1f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1399,6 +1399,7 @@
 dlls/msvcrt/Makefile
 dlls/msvcrt/tests/Makefile
 dlls/msvcrt20/Makefile
+dlls/msvcrtd/Makefile
 dlls/msvideo/Makefile
 dlls/msvideo/msrle32/Makefile
 dlls/netapi32/Makefile