[Development] Regression in Qt 5.12 with MinGW 7.3 on Windows 10 (Angle rendering backend)

[Dmitry Kazakov]

Hi, all!

It looks like there is a regression in Qt 5.12, specifically in Angle
rendering backend. For some reason HLSL compiler searching code patch has
been dropped between Qt 5.11.3 and Qt 5.12.0, so now it cannot find the
compiler (MinGW 7.3 still suggests to use d3dcompiler_43.dll, while modern
Windows 10 systems have d3dcompiler_47.dll only).

Here is the link to the patch that fixes the problem in Qt 5.12.0 branch:
https://github.com/dimula73/qtbase/commit/e6e0d33e97704b8b63ecec41ffeb113fd9cdb7f9

The plain-text file is attached.

PS:
I haven't found the code for automatic application for the patches from
src/angle/patches folder, so I just applied that manually and put the old
patch into the folder. Please correct me if my understanding is wrong.

-- 
Dmitry Kazakov
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