Don't declare unnecessary variable in wxUSE_NANOX wxX11 build.

Closes #16833.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78439 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/x11/window.cpp

@@ -178,9 +178,7 @@ bool wxWindowX11::Create(wxWindow *parent, wxWindowID id,
     bool need_two_windows = false;
 #endif
 
-#if wxUSE_NANOX
-    long xattributes = 0;
-#else
+#if !wxUSE_NANOX
     XSetWindowAttributes xattributes;
     long xattributes_mask = 0;