Release announcement:
https://blog.qt.io/blog/2019/02/01/qt-5-12-1-released/
Changelog:
https://wiki.qt.io/Qt_5.12.1_Change_Files
- A change was required to qt-dist.mk to always pass LOCALBASE to qmake,
as Qt5 has been installed to a prefix for some time now, there should
not be any harm in that, with respect to it picking up installed versions
of itself during build.
PR: 235622
Exp-run by: antoine
