[Bug 294957] graphics/mesa-dri: Update to 26.0.6

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294957

            Bug ID: 294957
           Summary: graphics/mesa-dri: Update to 26.0.6
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: [email protected]
          Reporter: [email protected]
          Assignee: [email protected]
             Flags: maintainer-feedback?([email protected])

Created attachment 270348
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=270348&action=edit
Update patch for 26.0.6

Some notes to make here:

1. I consolidated more common build options into mesa-dri's Makefile.common
file to improve maintenance and readability of the Mesa ports.

2. I migrated much of mesa-dri's Makefile build options to a Makefile.options
file.
 * The problem in Mesa 26 is that now all dri stub drivers are symlinks to one
real driver "libdril_dri.so" that mesa-dri only provides.
 * Because of this mesa-libs need to be built with the same driver options so
that each stub driver can actually function.
 * I only tested with loading from radeonsi.so since I'm only using the amdgpu
drm-kmod driver.

3. Since OSMesa support was removed in 25.1, the only affected consumers to
libosmesa are math/octave and math/vtk9.
* There is no workaround for this. These specific ports need to be updated as
shown in the attached patch.

4. Since 25.3.0, Mesa 26 requires the backport of drm-kmod's PR 357 to all
drm-kmod ports: https://github.com/freebsd/drm-kmod/pull/357
* Without this patch, the vulkan ioctls are broken and apps like mpv that use
them won't function properly with lag and errors.

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