https://bugs.gentoo.org/972754

We do not use vboxvideo but the default Makefile builds it anyway.

--- a/Makefile
+++ b/Makefile
@@ -42,7 +42,7 @@
 VBOX_QUIET_SH := set -x;
  endif
 
-all: vboxguest vboxsf vboxvideo
+all: vboxguest vboxsf
 
 vboxguest:
 	@echo "=== Building 'vboxguest' module ==="