freedreno header uses not installed xf86atomic.h

[Daniel Drake]

Hi,

Using libdrm-2.4.97, mesa fails to build on ARM with:

[  456s] In file included from
../../../../../src/gallium/drivers/freedreno/freedreno_util.h:33,
[  456s]                  from
../../../../../src/gallium/drivers/freedreno/freedreno_batch.h:34,
[  456s]                  from
../../../../../src/gallium/drivers/freedreno/freedreno_context.h:39,
[  456s]                  from
../../../../../src/gallium/drivers/freedreno/freedreno_program.c:33:
[  456s] /usr/include/freedreno/freedreno_ringbuffer.h:32:10: fatal
error: xf86atomic.h: No such file or directory

The freedreno headers were recently modified to use xf86atomic.h:
https://gitlab.freedesktop.org/mesa/drm/commit/b541d21a0a908bf98d44375720f4430297720743

However xf86atomic.h is not within the set of files installed by
libdrm. Should it be?

Thanks
Daniel