linuxPackages.virtualboxGuestAdditions: don't install VBoxOGL for now

It seems to be broken upstream too, and fixing it is far down the
priority list:
https://www.virtualbox.org/pipermail/vbox-dev/2017-June/014561.html
Additionally, 3d support seems to rely on VBoxOGL.so being symlinked
from libGL.so (which we can't), and Oracle doesn't plan on supporting
libglvnd either. (NixOS#18457)

pkgs/applications/virtualization/virtualbox/guest-additions/default.nix

@@ -107,11 +107,17 @@ stdenv.mkDerivation {
     wrapProgram $out/bin/VBoxClient-all \
             --prefix PATH : "${which}/bin"
 
-    # Install OpenGL libraries
-    mkdir -p $out/lib
-    cp -v lib/VBoxOGL*.so $out/lib
-    mkdir -p $out/lib/dri
-    ln -s $out/lib/VBoxOGL.so $out/lib/dri/vboxvideo_dri.so
+    # Don't install VBoxOGL for now
+    # It seems to be broken upstream too, and fixing it is far down the priority list:
+    # https://www.virtualbox.org/pipermail/vbox-dev/2017-June/014561.html
+    # Additionally, 3d support seems to rely on VBoxOGL.so being symlinked from
+    # libGL.so (which we can't), and Oracle doesn't plan on supporting libglvnd
+    # either. (#18457)
+    ## Install OpenGL libraries
+    #mkdir -p $out/lib
+    #cp -v lib/VBoxOGL*.so $out/lib
+    #mkdir -p $out/lib/dri
+    #ln -s $out/lib/VBoxOGL.so $out/lib/dri/vboxvideo_dri.so
 
     # Install desktop file
     mkdir -p $out/share/autostart