[Bug 256354] x11-drivers/xf86-video-intel: work around execbuffer2 test failure

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256354

            Bug ID: 256354
           Summary: x11-drivers/xf86-video-intel: work around execbuffer2
                    test failure
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11 at FreeBSD.org
          Reporter: jkim at FreeBSD.org
          Assignee: x11 at FreeBSD.org
             Flags: maintainer-feedback?(x11 at FreeBSD.org)

Created attachment 225476
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=225476&action=edit
work around execbuffer2 test failure

For long time, I was not able to enable DRI3 with SNA.  It turned out
DRM_IOCTL_I915_GEM_EXECBUFFER2 ioctl returns a different error code, i.e.,
ENOENT instead of EFAULT.  The attached patch fixed the following error for me.

(WW) intel(0): Detected unsupported/dysfunctional hardware, disabling
acceleration.

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