WIP: package wlroots with hwc2 backend

This MR packages wlroots-hwc2 compiled from @danct12 sources. Theoretically, this should be enough to run Phosh or Sway on devices that use Halium.

todo:

• make it conflict with base Phosh package
• make wlroots-hwc2 build with wlroots 0.11.0
• create postmarketos-ui-phosh-hwc2 don't need that thing
• investigate why Phoc needs wlroots.patch(it was removed because it was breaking the build)
• add libhybris-7.1 support(that should work, right?)
• test it!(currently I don't have a device with halium pmOS support, so that needs testing)
• make it work with Phosh
• make it work with Sway

ping @minlexx @danct12 @NotKit