[Development] forcing libxkbcommon to be present in the system makes newer Qt unusable on older linux distros

[NIkolai Marchenko]

 - [QTBUG-65503] Removed xkbcommon from bundled sources. This library is
   present on all supported platforms. The minimal required version now is
   0.5.0.


The change above makes updating Qt a gargantuan task for Centos 6 at least.

Building xkbcommon there requires meson (which centos 6 doesn't have)

and python 3.5 (same). And the library doesn't provide another way to
build itself.


Unless I misunderstand something this change hits older linuxes real hard.

Is it really necessary?
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