Stub enough of MSVCRT40 to make IE4 install work.

diff --git a/configure.ac b/configure.ac
index ed5167f..9807b83 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1547,6 +1547,7 @@
 dlls/msvcrt/Makefile
 dlls/msvcrt/tests/Makefile
 dlls/msvcrt20/Makefile
+dlls/msvcrt40/Makefile
 dlls/msvcrtd/Makefile
 dlls/msvideo/Makefile
 dlls/msvideo/msrle32/Makefile