meson: Set minimum compatible Meson version
The "qt6" module for detecting Qt 6 was introduced in 0.57 and finalized in 0.59. Declaring that we require at least Meson 0.59 ensures that everything is in place for building with Qt 6.
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The "qt6" module for detecting Qt 6 was introduced in 0.57 and finalized in 0.59. Declaring that we require at least Meson 0.59 ensures that everything is in place for building with Qt 6.