remove unused XIM.h

Change-Id: Icf15604a2d449159fceb212717264952e8cacb33
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/101282
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

compilerplugins/clang/unusedenumconstants.py

@@ -183,7 +183,6 @@ def is_ignore(srcLoc):
         # represents constants from an external API
          "opencl/inc/opencl_device_selection.h",
          "vcl/inc/sft.hxx",
-         "vcl/inc/unx/XIM.h",
          "vcl/unx/gtk/xid_fullscreen_on_all_monitors.c",
          "vcl/unx/gtk/salnativewidgets-gtk.cxx",
          "sc/inc/callform.hxx", # ParamType