random: remove windows-only compat.h include in randomenv

Note that this was probably only here to indirectly receive windows.h
via another include in compat.h (windows.h or winreg.h aren't included
there).

Also note that compat.h is already pulled in here for everyone via
util/time.h, so including inside a windows only ifdef is secondarily
redundant.

src/randomenv.cpp

@@ -15,7 +15,8 @@
 #include <support/cleanse.h>
 #include <util/time.h> // for GetTime()
 #ifdef WIN32
-#include <compat/compat.h>
+#include <windows.h>
+#include <winreg.h>
 #endif
 
 #include <algorithm>