cmakelists and windows_buildenv fixes

[JosepMaJAZ]

CMakelists.txt: Do not duplicate the runtime binaries on install dir.
windows_buildenv.bat : Fixes on the generation of the CMakeSettings.txt

[Be-ing]

Please fix pre-commit errors.

[JoergAtGithub]

Why you changed the type of CMAKE_PREFIX_PATH from path to string?

[JosepMaJAZ]

Why you changed the type of CMAKE_PREFIX_PATH from path to string?

Because PATH means that it is a folder, but here it actually is multiple paths, so it is a string.
Yet, I basically replicated what my manually generated CMakeSettings had.

Anyway, there might be something strange going on there, as the CMakeCache that I generated using cmake from commandline has this (UNINITIALIZED)
//No help, variable specified on the command line.
CMAKE_PREFIX_PATH:UNINITIALIZED=D:\programacio\mixxx\mixxx-master\buildenv\2.3-j00019-x64-release-fastbuild-static-55e94982-minimal;D:\programacio\mixxx\mixxx-master\buildenv\2.3-j00019-x64-release-fastbuild-static-55e94982-minimal\Qt-5.14.2

and the one on Visual studio has this (STRING):
CMAKE_PREFIX_PATH:STRING=D:\programacio\mixxx\mixxx-master\buildenv\2.3-j00019-x64-release-fastbuild-static-55e94982-minimal;D:\programacio\mixxx\mixxx-master\buildenv\2.3-j00019-x64-release-fastbuild-static-55e94982-minimal\Qt-5.14.2

[JoergAtGithub]

Did you know that you can download the patch file with the code style fixes as build artifact? https://github.com/mixxxdj/mixxx/suites/1700507024/artifacts/32000776

[Be-ing]

I don't know what's going on with this Windows stuff. @JoergAtGithub do you think this is ready to merge?

[JoergAtGithub]

I do not know the purpose of these console settings. Everything else looks reasonful to me. I did not tested it yet.

[JosepMaJAZ]

Those console settings are in order to create an UTF8 file with a BOM on it. My Visual Studio created file had such a BOM, so I tried to replicate it as much as I could.

In most cases, it could work without these changes, but this should ensure that it keeps working on other locales.

[Holzhaus]

https://bugs.launchpad.net/mixxx/+bug/1909873