msvcrt: Implement _wfindfirst64i32.

dlls/msvcr90/msvcr90.spec

diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index 33bfb33..2d5cc32 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -1181,7 +1181,7 @@
 @ stub _wfindfirst32
 @ stub _wfindfirst32i64
 @ stub _wfindfirst64
-@ stub _wfindfirst64i32
+@ cdecl _wfindfirst64i32(wstr ptr) msvcrt._wfindfirst64i32
 @ stub _wfindnext32
 @ stub _wfindnext32i64
 @ stub _wfindnext64