drm_prime_handle_to_fd_ioctl: translate O_ flags for Linuxulator

[valpackett]

Fixes FreeBSDDesktop/kms-drm#248 (damn why do we still have two repositories >_<)

note: I first wanted to do this in linux_ioctl.c in the linuxulator itself, but there we get the ioctl data before copying it from userspace, so that would mean copyin-fix-copyout which is awful.

testing: /compat/linux/bin/strace /compat/linux/bin/glxgears without any dri3 disabling variables (might also need to rebuild and reload linsysfs with https://reviews.freebsd.org/D26836 applied especially on amdgpu) — should be rendering in hardware, DRM_IOCTL_PRIME_HANDLE_TO_FD should be present without errors in the syscall trace

[zeising]

Against which branches does this apply? master isn't used, it was only used to import sources from Linux iirc.

[zeising]

Against which branches does this apply? master isn't used, it was only used to import sources from Linux iirc.

Disregard the above, was looking at the wrong repo..
Does this apply to the FreeBSD 12.1 and 11.4 versions as well?

[valpackett]

Yes, this should apply everywhere.

was looking at the wrong repo

haha this strikes again

damn why do we still have two repositories

[trasz]

Ping? Has this been committed? If no, what's required?