bcrypt: Add a stub for BCryptCloseAlgorithmProvider.

dlls/bcrypt/bcrypt.spec

 @ stub BCryptAddContextFunction
 @ stub BCryptAddContextFunctionProvider
-@ stub BCryptCloseAlgorithmProvider
+@ stdcall BCryptCloseAlgorithmProvider(ptr long)
 @ stub BCryptConfigureContext
 @ stub BCryptConfigureContextFunction
 @ stub BCryptCreateContext

dlls/bcrypt/bcrypt_main.c

@@ -90,3 +90,10 @@ NTSTATUS WINAPI BCryptOpenAlgorithmProvider(BCRYPT_ALG_HANDLE *algorithm, LPCWST
 
     return STATUS_NOT_IMPLEMENTED;
 }
+
+NTSTATUS WINAPI BCryptCloseAlgorithmProvider(BCRYPT_ALG_HANDLE algorithm, DWORD flags)
+{
+    FIXME("%p, %08x - stub\n", algorithm, flags);
+
+    return STATUS_NOT_IMPLEMENTED;
+}