There is no option to disable the Native QQC style from the build

While it is possible to disable all other Quick Controls styles from the build,
we cannot do the same for Native style (qtdeclarative/src/quicknativestyle).
It seems that this option was simply missed.

E.g. we can disable Imagine style from build via '-no-feature-quickcontrols2-imagine'
configure option or directly in CMake via '-DFEATURE_quickcontrols2_imagine=OFF'

But for Native style there is neither a CMake option nor a configure.