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qt5/qtbase.nix: add mysqlSupport
This commit switches `libmysqlclient`-enablement from `!=null`-style
to `fooSupport`-style, by adding an additional boolean parameter `mysqlSupport`.
This parameter defaults to
`stdenv.hostPlatform==stdenv.buildPlatform`, so there should be no
change in behavior for the non-cross-compiling case.
Co-authored-by:
Artturi <Artturin@artturin.com>