Moved private USER definitions to a new user_private.h header, and
removed the global user.h.

diff --git a/windows/spy.c b/windows/spy.c
index d765ef5..b83d060 100644
--- a/windows/spy.c
+++ b/windows/spy.c
@@ -30,6 +30,7 @@
 #include "wownt32.h"
 #include "wine/unicode.h"
 #include "win.h"
+#include "user_private.h"
 #include "wine/debug.h"
 #include "message.h"
 #include "winnls.h"