Merge remote-tracking branch 'origin/5.12.4' into 5.12

Change-Id: Ib3b937b770b3c6510104fb031f8616bb2602bd63

.qmake.conf

 load(qt_build_config)
 
-MODULE_VERSION = 5.12.3
+MODULE_VERSION = 5.12.4

dist/changes-5.12.4

+Qt 5.12.4 is a bug-fix release. It maintains both forward and backward
+compatibility (source and binary) with Qt 5.12.0 through 5.12.3.
+
+For more details, refer to the online documentation included in this
+distribution. The documentation is also available online:
+
+https://doc.qt.io/qt-5/index.html
+
+The Qt version 5.12 series is binary compatible with the 5.11.x series.
+Applications compiled for 5.11 will continue to run with 5.12.
+
+Some of the changes listed in this file include issue tracking numbers
+corresponding to tasks in the Qt Bug Tracker:
+
+https://bugreports.qt.io/
+
+Each of these identifiers can be entered in the bug tracker to obtain more
+information about a particular change.
+
+****************************************************************************
+*                            Qt 5.12.4 Changes                             *
+****************************************************************************
+
+ -  Fixed enumeration of 'Gadget' (/dev/ttyGS*) serial devices
+   on Linux.