[Bug 254470] graphics/mesa-libs: patch-src_loader_meson.build breaks DRI on broadwell with modesetting

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254470

            Bug ID: 254470
           Summary: graphics/mesa-libs: patch-src_loader_meson.build
                    breaks DRI on broadwell with modesetting
           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: bahlgren at beah.se
             Flags: maintainer-feedback?(x11 at FreeBSD.org)
          Assignee: x11 at FreeBSD.org

Updating my Thinkpad X250 (Broadwell chipset) to mesa-dri/libs 20.2.3 broke
direct rendering with the modesetting xorg driver. The xorg intel driver was
however ok, but with it, I needed to use MESA_LOADER_DRIVER_OVERRIDE=i965 to
get direct rendering.

I recompiled mesa-libs without the patch patch-src_loader_meson.build, and the
modesetting driver again enabled direct rendering.

This is on 11.4-STABLE r369446 with drm-fbsd11.2-kmod-4.11g20200420_1.

Sorry for the brevity, but can provide more info if needed!

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