This will allow us to drop gtk2 support from qtbase in future,
while still providing the gtk2 style for those who want to use it.
Also with moving to qtstyleplugins, the code can be simplified
because we can directly link to libraries we need, instead of using
QLibrary.
[ChangeLog][QtWidgets] Remove QGtkStyle, it is now provided in
qtstyleplugins repository.
Change-Id: I6221b1a513d7fda32e080f3ca159b0b2f8a8f246
Reviewed-by: Timo Jyrinki <timo.jyrinki@canonical.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Jens Bache-Wiig <jensbw@gmail.com>
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
Reviewed-by: J-P Nurmi <jpnurmi@theqtcompany.com>
Reviewed-by: Lisandro Damián Nicanor Pérez Meyer <perezmeyer@gmail.com>
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