ximcp: hide internal functions
commit 13e9ac4d "ximcp: Unmark to fabricate key events with XKeyEvent serial" added new _XimFabricateSerial / _XimUnfabricateSerial / _XimIsFabricatedSerial functions; they don't need to be exported by libX11.
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commit 13e9ac4d "ximcp: Unmark to fabricate key events with XKeyEvent serial" added new _XimFabricateSerial / _XimUnfabricateSerial / _XimIsFabricatedSerial functions; they don't need to be exported by libX11.