core: Remove moc artifact
* src/moc_kdpipeiodevice.cpp: Removed. * src/Makefile.am (EXTRA_DIST): Remove moc_kdpipeiodevice.cpp.
This file was overlooked in 58ed9c17 which removed the unused
and obsolete w32-qt code. See lang/qt QIODeviceDataProvider which
replaced kdpipeiodevice.