contrib: qt: add qmake6 to the meson tools
This is necessary to use the Qt from contribs on Windows, since it doesn't can't use CMake to detect Qt6 (https://github.com/mesonbuild/meson/pull/8432).
This is necessary to use the Qt from contribs on Windows, since it doesn't can't use CMake to detect Qt6 (https://github.com/mesonbuild/meson/pull/8432).
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