gnu: qt: Update to 5.12.4.
* gnu/packages/qt.scm (qt, qtbase, qtsvg, qtimageformats, qtx11extras,
qtxmlpatterns, qtdeclarative, qtconnectivity, qtwebsockets, qtsensors,
qtmultimedia, qtwayland, qtserialport, qtserialbus, qtwebchannel,
qtwebglplugin, qtwebview, qtlocation, qttools, qtscript,
qtquickcontrols, qtquickcontrols2, qtgraphicaleffects, qtgamepad,
qtscxml, qtpurchasing, qtcanvas3d, qtcharts, qtdatavis3d, qtnetworkauth,
qtremoteobjects, qtspeech): Update to 5.12.4.
(qt, qtbase)[source]: Remove xkbcommon from list of directories to remove.
(qtbase)[source]: Remove upstreamed patch.
(python-sip): Update to 4.19.18.
[source]: Update to new source uri.
(python-pyqt): Update to 5.12.3.
[source]: Update to new source uri.
* gnu/packages/patches/qtbase-old-kernel.patch: Remove patch.
* gnu/local.mk (dist_patch_DATA): Remove it.
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