gio: Rename gnetworkmonitorwindows to gwin32networkmonitor

This makes it more consistent with the other win32 objects in GIO. This
commit just renames the files; a follow-up commit will rename the
GObject.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

https://bugzilla.gnome.org/show_bug.cgi?id=685442

gio/meson.build

@@ -388,8 +388,8 @@ else
     'gwin32volumemonitor.c',
     'gwin32inputstream.c',
     'gwin32outputstream.c',
-    'gnetworkmonitorwindows.c',
-    'gnetworkmonitorwindows.h',
+    'gwin32networkmonitor.c',
+    'gwin32networkmonitor.h',
   )
 
   gio_win_rc = configure_file(