[igt-dev] [PATCH i-g-t v2 0/19] Allow building igt without graphics dependencies

[Ryszard Knop]

This patchset allows building igt without cairo and pixman, making its tools
conveniently available in compute-only environments for debugging purposes.
Building tests, overlays and some graphics-dependent tools is not available
in this scenario, but most of the interesting stuff is in there.

The new graphics=<enabled/disabled> build-time setting decides whenever igt
requires cairo and pixman. Disabling those dependencies prevents transitive
dependencies on a large number of graphics-related libraries (X11, etc).

Unfortunately, previous 2 patchsets did not get reviewed - resending for
easier testing.

v2:
- Merge the header cleanup patchset into this one
- Rebase onto current master